$UDR
UDR, Inc. Stock $udr

$udr Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000007420813000007 Filed on February 27, 2013

Income Statement

Concept	2012 Q4	2011 Q4	2010 Q4
Revenue	$176.1M	$159.0M	$89.90M
YoY Change	10.75%	76.86%	-41.36%
Cost Of Revenue	$58.80M	$46.00M	$23.70M
YoY Change	27.83%	94.09%	-56.27%
Gross Profit	$117.3M	$113.0M	$66.20M
YoY Change	3.81%	70.69%	-33.2%
Gross Profit Margin	66.61%	71.07%	73.64%
Selling, General & Admin	$10.70M	$17.80M	$13.30M
YoY Change	-39.89%	33.83%	10.83%
% of Gross Profit	9.12%	15.75%	20.09%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$84.50M	$98.30M	$83.10M
YoY Change	-14.04%	18.29%	15.26%
% of Gross Profit	72.04%	86.99%	125.53%
Operating Expenses	$94.50M	$109.1M	$55.60M
YoY Change	-13.38%	96.22%	-34.82%
Operating Profit	$22.80M	$3.900M	$10.60M
YoY Change	484.62%	-63.21%	-23.19%
Interest Expense	-$32.30M	-$39.60M	-$140.9M
YoY Change	-18.43%	-71.89%	280.81%
% of Operating Profit	-141.67%	-1015.38%	-1329.25%
Other Income/Expense, Net			$100.0M
YoY Change
Pretax Income	-$18.00M	-$35.70M	-$36.10M
YoY Change	-49.58%	-1.11%	39.38%
Income Tax	-$1.600M	-$5.800M	-$2.500M
% Of Pretax Income
Net Earnings	-$12.30M	$46.50M	-$28.50M
YoY Change	-126.45%	-263.16%	14.46%
Net Earnings / Revenue	-6.98%	29.25%	-31.7%
Basic Earnings Per Share
Diluted Earnings Per Share	-$49.22K	$197.0K	-$153.6K
COMMON SHARES
Basic Shares Outstanding	250.1M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2012 Q4	2011 Q4	2010 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$12.10M	$12.50M	$9.500M
YoY Change	-3.2%	31.58%	58.33%
Cash & Equivalents	$12.12M	$12.50M	$9.486M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$12.10M	$12.50M	$9.500M
YoY Change	-3.2%	31.58%	58.33%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.131B	$5.911B	$4.791B
YoY Change	3.73%	23.37%	-3.16%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$477.6M	$213.0M	$151.9M
YoY Change	124.2%	40.25%	193.24%
Other Assets	$48.60M	$387.0M	$494.8M
YoY Change	-87.44%	-21.79%	847.89%
Total Long-Term Assets	$6.847B	$6.709B	$5.520B
YoY Change	2.06%	21.54%	7.67%
TOTAL ASSETS
Total Short-Term Assets	$12.10M	$12.50M	$9.500M
Total Long-Term Assets	$6.847B	$6.709B	$5.520B
Total Assets	$6.859B	$6.721B	$5.530B
YoY Change	2.05%	21.55%	7.73%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$104.6M	$95.50M	$105.9M
YoY Change	9.53%	-9.82%	31.23%
Accrued Expenses	$30.90M	$23.20M	$20.90M
YoY Change	33.19%	11.0%	9.42%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$232.5M	$218.6M	$204.0M
YoY Change	6.36%	7.16%	13.71%
LONG-TERM LIABILITIES
Long-Term Debt	$3.409B	$3.918B	$3.568B
YoY Change	-12.99%	9.84%	4.11%
Other Long-Term Liabilities		$29.10M	$28.90M
YoY Change		0.69%	0.35%
Total Long-Term Liabilities	$3.409B	$3.948B	$3.596B
YoY Change	-13.63%	9.76%	4.08%
TOTAL LIABILITIES
Total Short-Term Liabilities	$232.5M	$218.6M	$204.0M
Total Long-Term Liabilities	$3.409B	$3.948B	$3.596B
Total Liabilities	$3.642B	$4.166B	$3.923B
YoY Change	-12.58%	6.19%	4.98%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$2.501M	$2.197M
YoY Change	13.84%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.993B	$2.314B	$1.606B
YoY Change
Total Liabilities & Shareholders Equity	$6.859B	$6.721B	$5.530B
YoY Change	2.05%	21.55%	7.73%

Cashflow Statement

Concept	2012 Q4	2011 Q4	2010 Q4
OPERATING ACTIVITIES
Net Income	-$12.30M	$46.50M	-$28.50M
YoY Change	-126.45%	-263.16%	14.46%
Depreciation, Depletion And Amortization	$84.50M	$98.30M	$83.10M
YoY Change	-14.04%	18.29%	15.26%
Cash From Operating Activities	$77.50M	$68.50M	$56.70M
YoY Change	13.14%	20.81%	42.82%
INVESTING ACTIVITIES
Capital Expenditures	-$209.6M	-$175.5M	-$39.60M
YoY Change	19.43%	343.18%	-36.64%
Acquisitions
YoY Change
Other Investing Activities	$59.40M	$207.6M	-$65.30M
YoY Change	-71.39%	-417.92%	-65400.0%
Cash From Investing Activities	-$150.1M	$32.10M	-$105.0M
YoY Change	-567.6%	-130.57%	68.54%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	2.400M	-101.6M	47.60M
YoY Change	-102.36%	-313.45%	1222.22%
NET CHANGE
Cash From Operating Activities	77.50M	68.50M	56.70M
Cash From Investing Activities	-150.1M	32.10M	-105.0M
Cash From Financing Activities	2.400M	-101.6M	47.60M
Net Change In Cash	-70.20M	-1.000M	-700.0K
YoY Change	6920.0%	42.86%	-96.32%
FREE CASH FLOW
Cash From Operating Activities	$77.50M	$68.50M	$56.70M
Capital Expenditures	-$209.6M	-$175.5M	-$39.60M
Free Cash Flow	$287.1M	$244.0M	$96.30M
YoY Change	17.66%	153.37%	-5.77%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	1143781000	USD
CY2011Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	1142895000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-13902000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-11257000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4098882000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3340470000	USD
CY2012	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Advertising costs</font></div><div style="line-height:120%;padding-top:13px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">All advertising costs are expensed as incurred and reported on the Consolidated Statements of Operations within the line item “Administrative and marketing”</font></div></div>
CY2012	us-gaap	Advertising Expense AdvertisingExpense	6200000	USD
CY2011	us-gaap	Advertising Expense AdvertisingExpense	5400000	USD
CY2010	us-gaap	Advertising Expense AdvertisingExpense	6400000	USD
CY2012	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	0	USD
CY2010	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	3530000	USD
CY2011	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1077000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	8696000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4158000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	8957000	USD
CY2011Q4	us-gaap	Assets Assets	6721354000	USD
CY2012Q4	us-gaap	Assets Assets	6888509000	USD
CY2012Q4	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	11600000	USD
CY2011Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	332258000	USD
CY2012Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	0	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	4700000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	3100000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	3500000	USD
CY2012Q4	us-gaap	Business Acquisition Contingent Consideration At Fair Value BusinessAcquisitionContingentConsiderationAtFairValue	0	USD
CY2011Q4	us-gaap	Business Acquisition Contingent Consideration At Fair Value BusinessAcquisitionContingentConsiderationAtFairValue	3000000	USD
CY2010Q4	us-gaap	Business Acquisition Contingent Consideration At Fair Value BusinessAcquisitionContingentConsiderationAtFairValue	0	USD
CY2010Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	23600000	USD
CY2011Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	34300000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Amortizable Intangible Assets BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets	1500000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Property BusinessAcquisitionPurchasePriceAllocationProperty	102100000	USD
CY2012	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2300000	USD
CY2010	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2900000	USD
CY2011	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4800000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.87
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Plant BusinessAcquisitionPurchasePriceAllocationPlant	37300000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Equipment BusinessAcquisitionPurchasePriceAllocationEquipment	1500000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Liabilities Assumed BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed	38100000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	12115000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	12503000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9486000	USD
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CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	3017000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-388000	USD
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CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.880
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CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	350000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	250139408	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	219650225	shares
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CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	219650225	shares
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	2501000	USD
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CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	214822000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	9590000	USD
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CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2533000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1961000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	463000	USD
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CY2010	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	27907000	USD
CY2011	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	32595000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-110176000	USD
CY2011	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	326788000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	158000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-3807000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	223028000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	9748000	USD
CY2010	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	1152000	USD
CY2011	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	2009000	USD
CY2012	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	24551000	USD
CY2011	us-gaap	Contribution Of Property ContributionOfProperty	4078000	USD
CY2010	us-gaap	Contribution Of Property ContributionOfProperty	0	USD
CY2012	us-gaap	Contribution Of Property ContributionOfProperty	0	USD
CY2011	us-gaap	Conversion Of Stock Shares Converted1 ConversionOfStockSharesConverted1	12511	shares
CY2010	us-gaap	Conversion Of Stock Shares Converted1 ConversionOfStockSharesConverted1	923944	shares
CY2012	us-gaap	Conversion Of Stock Shares Converted1 ConversionOfStockSharesConverted1	20438	shares
CY2012	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	34383000	USD
CY2011	us-gaap	Costmethod Investments Realized Gain Loss Excluding Other Than Temporary Impairments CostmethodInvestmentsRealizedGainLossExcludingOtherThanTemporaryImpairments	3946000	USD
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CY2012	us-gaap	Costmethod Investments Realized Gain Loss Excluding Other Than Temporary Impairments CostmethodInvestmentsRealizedGainLossExcludingOtherThanTemporaryImpairments	0	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	762937000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	794102000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	641311000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	977000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1463000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3510000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1015000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3424000	USD
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CY2012	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.0442
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CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6646000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-21479000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	119000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	30068000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	24990000	USD
CY2012Q4	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	29406000	USD
CY2011Q4	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	29100000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-24500000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6556000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
CY2010Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	640000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	0	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	0	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	1424000	USD
CY2012	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	0	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-865000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-119000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3021000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-90000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	3618000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	3346000	USD
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CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	25565000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	45134000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	62712000	USD
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CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	999000	USD
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CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1390000	USD
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CY2012Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	3100000	USD
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CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	640000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2010	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4843000	USD
CY2010	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	9132000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	6777000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4105000	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	3931000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	354505000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	308289000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	374274000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	7649000	USD
CY2012Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	11600000	USD
CY2011Q4	us-gaap	Development In Process DevelopmentInProcess	246229000	USD
CY2012Q4	us-gaap	Development In Process DevelopmentInProcess	489795000	USD
CY2010	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	4083000	USD
CY2012	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	260404000	USD
CY2011	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	138508000	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	8850000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	13218000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	0	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	1967000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	7338000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	89443000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	18531000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	115904000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	18520000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	7259000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	11785000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Rental Income DisposalGroupIncludingDiscontinuedOperationRentalIncome	121318000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Rental Income DisposalGroupIncludingDiscontinuedOperationRentalIncome	107963000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Rental Income DisposalGroupIncludingDiscontinuedOperationRentalIncome	30316000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	123163000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	107963000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	277000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	30316000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	126086000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	215654000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	165590000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	57915000	USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	51019000	USD
CY2012	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.85
CY2011	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.05
CY2010	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.68
CY2011Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.20
CY2011Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.17
CY2012Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.05
CY2011Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.06
CY2012Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.62
CY2011Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.07
CY2012Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.37
CY2012Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.04
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	11202000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	50580000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	1125000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	507037000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	213040000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	21400000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11900000	USD
CY2011Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	244101000	USD
CY2012Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	272640000	USD
CY2012	us-gaap	Gain Loss On Disposition Of Real Estate Discontinued Operations GainLossOnDispositionOfRealEstateDiscontinuedOperations	251554000	USD
CY2011	us-gaap	Gain Loss On Disposition Of Real Estate Discontinued Operations GainLossOnDispositionOfRealEstateDiscontinuedOperations	125928000	USD
CY2010	us-gaap	Gain Loss On Disposition Of Real Estate Discontinued Operations GainLossOnDispositionOfRealEstateDiscontinuedOperations	4083000	USD
CY2010	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	4725000	USD
CY2011	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	3123000	USD
CY2012	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	0	USD
CY2012Q4	us-gaap	General Partners Capital Account Units Outstanding GeneralPartnersCapitalAccountUnitsOutstanding	174886035	shares
CY2011Q4	us-gaap	General Partners Capital Account Units Outstanding GeneralPartnersCapitalAccountUnitsOutstanding	174859951	shares
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-1133000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1204000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4602000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-43036000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-117930000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-123225000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-13111000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-32847000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-26222000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1741000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-34130000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-23123000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-8543000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-30026000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	-0.25
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	-0.75
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	-0.66
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	263339000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	11342000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	143810000	USD
CY2011Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	74340000	USD
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	4191000	USD
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	16240000	USD
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	156000	USD
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	49039000	USD
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	84887000	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	179429000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	0.71
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	1.10
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	0.07
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-8579000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-6352000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-4204000	USD
CY2012Q4	us-gaap	Income Tax Examination Likelihood Of Unfavorable Settlement IncomeTaxExaminationLikelihoodOfUnfavorableSettlement	not (greater than 50 percent probability)
CY2012Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	0	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-21076000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7571000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2533000	USD
CY2010	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	-2533000	USD
CY2011	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	-5647000	USD
CY2012	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	-30282000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-43744000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-7470000	USD
CY2010	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	18554000	USD
CY2011	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	31363000	USD
CY2012	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	2688000	USD
CY2010	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	-39000	USD
CY2010	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-4660000	USD
CY2012	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-2639000	USD
CY2011	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-12582000	USD
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1279000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1508000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	631000	shares
CY2012Q4	us-gaap	Ineffectiveness On Interest Rate Fair Value Hedges Is Immaterial IneffectivenessOnInterestRateFairValueHedgesIsImmaterial	less than a $1,000
CY2012	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	26400000	USD
CY2010	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	12500000	USD
CY2011	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	13000000	USD
CY2012	us-gaap	Interest Expense Debt InterestExpenseDebt	139069000	USD
CY2011	us-gaap	Interest Expense Debt InterestExpenseDebt	150687000	USD
CY2010	us-gaap	Interest Expense Debt InterestExpenseDebt	138724000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	168577000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	159501000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	154843000	USD
CY2012Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	30937000	USD
CY2011Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	23208000	USD
CY2012Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	6700000	USD
CY2011Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	5203484000	USD
CY2012Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	5384971000	USD
CY2010	us-gaap	Labor And Related Expense LaborAndRelatedExpense	44795000	USD
CY2011	us-gaap	Labor And Related Expense LaborAndRelatedExpense	50009000	USD
CY2012	us-gaap	Labor And Related Expense LaborAndRelatedExpense	55132000	USD
CY2012Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	1907169000	USD
CY2011Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	1821762000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	4166095000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	3671259000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6721354000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6888509000	USD
CY2011Q4	us-gaap	Limited Partners Capital Account Units Outstanding LimitedPartnersCapitalAccountUnitsOutstanding	184281253	shares
CY2009Q4	us-gaap	Limited Partners Capital Account Units Outstanding LimitedPartnersCapitalAccountUnitsOutstanding	179909408	shares
CY2012Q4	us-gaap	Limited Partners Capital Account Units Outstanding LimitedPartnersCapitalAccountUnitsOutstanding	184281253	shares
CY2010Q4	us-gaap	Limited Partners Capital Account Units Outstanding LimitedPartnersCapitalAccountUnitsOutstanding	179909408	shares
CY2012Q4	us-gaap	Line Of Credit LineOfCredit	3900000	USD
CY2011Q4	us-gaap	Line Of Credit LineOfCredit	3600000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	842500000	USD
CY2012	us-gaap	Line Of Credit Facility Commitment Fee Description LineOfCreditFacilityCommitmentFeeDescription	22.5
CY2012	us-gaap	Line Of Credit Facility Interest Rate Description LineOfCreditFacilityInterestRateDescription	122.5
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	3409333000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	3918370000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1466623000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	171895000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	244883000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	568839000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	597811000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	359282000	USD
CY2010	us-gaap	Loss From Catastrophes LossFromCatastrophes	0	USD
CY2012	us-gaap	Loss From Catastrophes LossFromCatastrophes	8495000	USD
CY2011	us-gaap	Loss From Catastrophes LossFromCatastrophes	0	USD
CY2011	us-gaap	Management Fees Revenue ManagementFeesRevenue	9600000	USD
CY2012	us-gaap	Management Fees Revenue ManagementFeesRevenue	11800000	USD
CY2010	us-gaap	Management Fees Revenue ManagementFeesRevenue	3200000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	4734000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	916000	USD
CY2012	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	11392000	USD
CY2011	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-13978000	USD
CY2010	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-48236000	USD
CY2012	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	4871000	USD
CY2011	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	450000	USD
CY2012Q4	us-gaap	Minority Interest In Joint Ventures MinorityInterestInJointVentures	-507037000	USD
CY2011Q4	us-gaap	Minority Interest In Joint Ventures MinorityInterestInJointVentures	-213040000	USD
CY2011	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	167000	USD
CY2012	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	140000	USD
CY2010	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	146000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	373075000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	811963000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-108344000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-583754000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-209385000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1053182000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	214180000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	244236000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	317341000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	-102899000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	212177000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	20023000	USD
CY2011	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	167000	USD
CY2010	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	146000	USD
CY2012	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	140000	USD
CY2012	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	7986000	USD
CY2011	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	395000	USD
CY2010	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-3835000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	203376000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	10537000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-112362000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	44190000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	145721000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-15559000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-13231000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-9962000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	12149000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	80848000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-30243000	USD
CY2011	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	278657000	USD
CY2010	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	91442000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	34412000	USD
CY2010	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	0	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	0	USD
CY2011	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	268853000	USD
CY2012	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	913000	USD
CY2011	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	880000	USD
CY2012Q4	us-gaap	Notes Receivable Net NotesReceivableNet	64006000	USD
CY2011Q4	us-gaap	Notes Receivable Net NotesReceivableNet	0	USD
CY2012	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	Segments
CY2011Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	5900000	USD
CY2012Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	5200000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	-122520000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	-116259000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	-64739000	USD
CY2011	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	622995000	USD
CY2012	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	713928000	USD
CY2012	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	8741000	USD
CY2010	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	512550000	USD
CY2012Q1	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	172242000	USD
CY2011Q2	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	150636000	USD
CY2012Q2	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	177475000	USD
CY2012Q3	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	181766000	USD
CY2011Q3	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	163859000	USD
CY2012Q4	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	182445000	USD
CY2011Q1	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	137812000	USD
CY2011Q4	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	170688000	USD
CY2010	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	11411000	USD
CY2011	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	9815000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	125654000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	198365000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3588000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-10837000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2725000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-4584000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-3492000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-4924000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-16477000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-9273000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3492000	USD
CY2010	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5773000	USD
CY2011	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5990000	USD
CY2012	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5748000	USD
CY2010	us-gaap	Other General And Administrative Expense OtherGeneralAndAdministrativeExpense	45243000	USD
CY2012	us-gaap	Other General And Administrative Expense OtherGeneralAndAdministrativeExpense	43059000	USD
CY2011	us-gaap	Other General And Administrative Expense OtherGeneralAndAdministrativeExpense	45915000	USD
CY2010	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	730000	USD
CY2011	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	646000	USD
CY2012	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	2700000	USD
CY2010	us-gaap	Other Operating Income OtherOperatingIncome	12502000	USD
CY2011	us-gaap	Other Operating Income OtherOperatingIncome	17422000	USD
CY2012	us-gaap	Other Operating Income OtherOperatingIncome	15435000	USD
CY2011Q4	us-gaap	Other Restricted Assets OtherRestrictedAssets	24634000	USD
CY2012Q4	us-gaap	Other Restricted Assets OtherRestrictedAssets	23561000	USD
CY2011	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	55356000	USD
CY2010	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2012	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2011	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	17131000	USD
CY2010	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	14095000	USD
CY2012	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	19632000	USD
CY2012Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	184281253	shares
CY2011Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	184281253	shares
CY2011	us-gaap	Partners Capital Account Units Acquisitions PartnersCapitalAccountUnitsAcquisitions	4371845	shares
CY2010	us-gaap	Partners Capital Account Units Redeemed PartnersCapitalAccountUnitsRedeemed	0	shares
CY2011	us-gaap	Partners Capital Account Units Redeemed PartnersCapitalAccountUnitsRedeemed	0	shares
CY2012	us-gaap	Partners Capital Account Units Redeemed PartnersCapitalAccountUnitsRedeemed	0	shares
CY2010	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	73977000	USD
CY2011	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	91476000	USD
CY2012	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	144877000	USD
CY2012	us-gaap	Payments For Proceeds From Deposits On Real Estate Acquisitions PaymentsForProceedsFromDepositsOnRealEstateAcquisitions	0	USD
CY2010	us-gaap	Payments For Proceeds From Deposits On Real Estate Acquisitions PaymentsForProceedsFromDepositsOnRealEstateAcquisitions	0	USD
CY2011	us-gaap	Payments For Proceeds From Deposits On Real Estate Acquisitions PaymentsForProceedsFromDepositsOnRealEstateAcquisitions	80397000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	207470000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	120729000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	150446000	USD
CY2012	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	9033000	USD
CY2010	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	4314000	USD
CY2011	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	10947000	USD
CY2011	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	9311000	USD
CY2010	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	9488000	USD
CY2012	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	6954000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8244000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4316000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	13465000	USD
CY2012	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	4100000	USD
CY2012	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	282714000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	102810000	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	110921000	USD
CY2011	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	0	USD
CY2012	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	0	USD
CY2010	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	16141000	USD
CY2010	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	0	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	0	USD
CY2012	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	4871000	USD
CY2010	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	4342000	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	13267000	USD
CY2012	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	7947000	USD
CY2012	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	246923000	USD
CY2011	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	98683000	USD
CY2010	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	92142000	USD
CY2010	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3726000	USD
CY2011	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3724000	USD
CY2012	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3724000	USD
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0
CY2011	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	175000	USD
CY2012	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	2791000	USD
CY2010	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	-25000	USD
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	467565000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	879754000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	756138000	USD
CY2010	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
CY2011	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	7800000	USD
CY2012	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	-63998000	USD
CY2010	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	68380000	USD
CY2011	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	30728000	USD
CY2012	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	250000	USD
CY2011	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	3866000	USD
CY2010	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	5446000	USD
CY2012	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	-9861000	USD
CY2012	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	396400000	USD
CY2011	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	296964000	USD
CY2010	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	399190000	USD
CY2012	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-345000000	USD
CY2010	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-157550000	USD
CY2011	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	389250000	USD
CY2012	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	-81609000	USD
CY2010	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	-637000	USD
CY2011	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	-3597000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	39488000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	9799000	USD
CY2011	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	321803000	USD
CY2012	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	593167000	USD
CY2010	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	20738000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	20585000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	-106588000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	220303000	USD
CY2012Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1924682000	USD
CY2011Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1831727000	USD
CY2010Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1638326000	USD
CY2009Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1351293000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	341925000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	340800000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	297889000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	7183000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	13945000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	0	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	148524000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	233207000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	3673000	USD
CY2011	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	587101000	USD
CY2012	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	559154000	USD
CY2010	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	20328000	USD
CY2010Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	6881347000	USD
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8074471000	USD
CY2012Q4	us-gaap	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	7100000000	USD
CY2009Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	6315047000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8055828000	USD
CY2012	us-gaap	Real Estate Improvements RealEstateImprovements	422480000	USD
CY2010	us-gaap	Real Estate Improvements RealEstateImprovements	167986000	USD
CY2011	us-gaap	Real Estate Improvements RealEstateImprovements	189711000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1605090000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1923429000	USD
CY2012Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	7564780000	USD
CY2011Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	7269347000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	5641351000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	5664257000	USD
CY2012	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	141648000	USD
CY2011	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	1590514000	USD
CY2010	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	425825000	USD
CY2011	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	0	USD
CY2012	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	13945000	USD
CY2010	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	7183000	USD
CY2012	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	87121000	USD
CY2011	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	75884000	USD
CY2010	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	62726000	USD
CY2011Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	236475000	USD
CY2010Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	119057000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	223418000	USD
CY2011Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	236475000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	223418000	USD
CY2011	us-gaap	Redeemable Preferred Stock Dividends RedeemablePreferredStockDividends	5587000	USD
CY2010	us-gaap	Redeemable Preferred Stock Dividends RedeemablePreferredStockDividends	5762000	USD
CY2012	us-gaap	Redeemable Preferred Stock Dividends RedeemablePreferredStockDividends	2286000	USD
CY2012	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	300000	USD
CY2012	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	491885000	USD
CY2011	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	336004000	USD
CY2010	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	187308000	USD
CY2011	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	264829000	USD
CY2012	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	100000000	USD
CY2010	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	79236000	USD
CY2011	us-gaap	Restructuring Charges RestructuringCharges	1342000	USD
CY2012	us-gaap	Restructuring Charges RestructuringCharges	733000	USD
CY2010	us-gaap	Restructuring Charges RestructuringCharges	6803000	USD
CY2011	us-gaap	Revenues Revenues	640417000	USD
CY2012	us-gaap	Revenues Revenues	729363000	USD
CY2010	us-gaap	Revenues Revenues	525052000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	1430135000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	1891553000	USD
CY2012	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	744244000	USD
CY2010	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	633868000	USD
CY2011	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	730958000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	0	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	0
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2430127000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1905015000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	12.63
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	13.25
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2430127000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2690802000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.61
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.63
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.37
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P5Y4M24D
CY2012	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	20438	shares
CY2008	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	9957233	shares
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	260675000	shares
CY2011	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	287000	USD
CY2012	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	529000	USD
CY2010	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	18429000	USD
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	467564000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	756138000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	879754000	USD
CY2011	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	11002000	USD
CY2012	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-742000	USD
CY2010	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	15726000	USD
CY2012	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	81609000	USD
CY2010	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	637000	USD
CY2011	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	3597000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	2992916000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	2314050000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2993832000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2318784000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1398982000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1610030000	USD
CY2012Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	14076000	USD
CY2011Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	13397000	USD
CY2011	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	192576000	USD
CY2012	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2010	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2011Q4	us-gaap	Unsecured Debt UnsecuredDebt	2026817000	USD
CY2012Q4	us-gaap	Unsecured Debt UnsecuredDebt	1979198000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of estimates</font></div><div style="line-height:120%;padding-top:13px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of these financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates.</font></div></div>
CY2011	us-gaap	Utilities Costs UtilitiesCosts	33782000	USD
CY2010	us-gaap	Utilities Costs UtilitiesCosts	28117000	USD
CY2012	us-gaap	Utilities Costs UtilitiesCosts	36913000	USD
CY2012	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-43700000	USD
CY2012	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	238851000	shares
CY2011	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	201294000	shares
CY2010	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	165857000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	239482000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	167365000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	202573000	shares
CY2011Q4	udr	Accounts Payable Accrued Expenses And Other Liabilities AccountsPayableAccruedExpensesAndOtherLiabilities	95485000	USD
CY2012Q4	udr	Accounts Payable Accrued Expenses And Other Liabilities AccountsPayableAccruedExpensesAndOtherLiabilities	87003000	USD
CY2011Q4	udr	Accumulated Depreciation Of Assets Of Disposal Group Including Discontinued Operations AccumulatedDepreciationOfAssetsOfDisposalGroupIncludingDiscontinuedOperations	226067000	USD
CY2012Q4	udr	Accumulated Depreciation Of Assets Of Disposal Group Including Discontinued Operations AccumulatedDepreciationOfAssetsOfDisposalGroupIncludingDiscontinuedOperations	0	USD
CY2012	udr	Acquisition Of Real Estate Assets Net Of Liabilities Assumed And Initial Capital Expenditures AcquisitionOfRealEstateAssetsNetOfLiabilitiesAssumedAndInitialCapitalExpenditures	106673000	USD
CY2010	udr	Acquisition Of Real Estate Assets Net Of Liabilities Assumed And Initial Capital Expenditures AcquisitionOfRealEstateAssetsNetOfLiabilitiesAssumedAndInitialCapitalExpenditures	347582000	USD
CY2011	udr	Acquisition Of Real Estate Assets Net Of Liabilities Assumed And Initial Capital Expenditures AcquisitionOfRealEstateAssetsNetOfLiabilitiesAssumedAndInitialCapitalExpenditures	989029000	USD
CY2011Q4	udr	Additional Contribution Made By Company AdditionalContributionMadeByCompany	3000000	USD
CY2011	udr	Administrative And Marketing AdministrativeAndMarketing	13204000	USD
CY2012	udr	Administrative And Marketing AdministrativeAndMarketing	15929000	USD
CY2010	udr	Administrative And Marketing AdministrativeAndMarketing	11963000	USD
CY2012	udr	Allocation To Redeemable Non Controllable Interests AllocationToRedeemableNonControllableInterests	80000	USD
CY2011	udr	Allocation To Redeemable Non Controllable Interests AllocationToRedeemableNonControllableInterests	-404000	USD
CY2011	udr	Amortization Accretion Of Companys Carrying Value Of Its Equity Method Investment AmortizationAccretionOfCompanysCarryingValueOfItsEquityMethodInvestment	1100000	USD
CY2010	udr	Amortization Accretion Of Companys Carrying Value Of Its Equity Method Investment AmortizationAccretionOfCompanysCarryingValueOfItsEquityMethodInvestment	300000	USD
CY2012	udr	Amortization Accretion Of Companys Carrying Value Of Its Equity Method Investment AmortizationAccretionOfCompanysCarryingValueOfItsEquityMethodInvestment	184000	USD
CY2011	udr	Apartment Homes Sold ApartmentHomesSold	1418	Apartment_Homes
CY2012	udr	Cash Paid In Nonmonetary Asset Exchange CashPaidInNonmonetaryAssetExchange	0	USD
CY2010	udr	Cash Paid In Nonmonetary Asset Exchange CashPaidInNonmonetaryAssetExchange	0	USD
CY2011	udr	Cash Paid In Nonmonetary Asset Exchange CashPaidInNonmonetaryAssetExchange	28124000	USD
CY2010	udr	Change In Equity From Net Loss Income Attributable To Common Stockholders And Conversion Of Operating Partnership Units To Companys Common Stock ChangeInEquityFromNetLossIncomeAttributableToCommonStockholdersAndConversionOfOperatingPartnershipUnitsToCompanysCommonStock	-93933000	USD
CY2011	udr	Change In Equity From Net Loss Income Attributable To Common Stockholders And Conversion Of Operating Partnership Units To Companys Common Stock ChangeInEquityFromNetLossIncomeAttributableToCommonStockholdersAndConversionOfOperatingPartnershipUnitsToCompanysCommonStock	10824000	USD
CY2012	udr	Change In Equity From Net Loss Income Attributable To Common Stockholders And Conversion Of Operating Partnership Units To Companys Common Stock ChangeInEquityFromNetLossIncomeAttributableToCommonStockholdersAndConversionOfOperatingPartnershipUnitsToCompanysCommonStock	203905000	USD
CY2012Q4	udr	Communities Held For Sale CommunitiesHeldForSale	0	Communities
CY2011	udr	Communities Sold CommunitiesSold	6	Communities
CY2012	udr	Condition For Community Considered To Have Stabilized Occupancy ConditionForCommunityConsideredToHaveStabilizedOccupancy	90% occupancy for at least three consecutive months
CY2010	udr	Contribution Of Purchase Deposit Made To Unconsolidated Joint Venture ContributionOfPurchaseDepositMadeToUnconsolidatedJointVenture	0	USD
CY2011	udr	Contribution Of Purchase Deposit Made To Unconsolidated Joint Venture ContributionOfPurchaseDepositMadeToUnconsolidatedJointVenture	0	USD
CY2012	udr	Contribution Of Purchase Deposit Made To Unconsolidated Joint Venture ContributionOfPurchaseDepositMadeToUnconsolidatedJointVenture	80397000	USD
CY2012Q4	udr	Cost Incurred To Date CostIncurredToDate	633044000	USD
CY2012	udr	Debt Instrument Weighted Average Years To Maturity DebtInstrumentWeightedAverageYearsToMaturity	P4Y6M
CY2011Q4	udr	Deferred Tax Asset Debt And Interest Deductions DeferredTaxAssetDebtAndInterestDeductions	0	USD
CY2010Q4	udr	Deferred Tax Asset Debt And Interest Deductions DeferredTaxAssetDebtAndInterestDeductions	10784000	USD
CY2012Q4	udr	Deferred Tax Asset Debt And Interest Deductions DeferredTaxAssetDebtAndInterestDeductions	0	USD
CY2010Q4	udr	Deferred Tax Assets Asset Capitalization Differences DeferredTaxAssetsAssetCapitalizationDifferences	5235000	USD
CY2012Q4	udr	Deferred Tax Assets Asset Capitalization Differences DeferredTaxAssetsAssetCapitalizationDifferences	6635000	USD
CY2011Q4	udr	Deferred Tax Assets Asset Capitalization Differences DeferredTaxAssetsAssetCapitalizationDifferences	5948000	USD
CY2010Q4	udr	Deferred Tax Assets Depreciation DeferredTaxAssetsDepreciation	9708000	USD
CY2012Q4	udr	Deferred Tax Assets Depreciation DeferredTaxAssetsDepreciation	12345000	USD
CY2011Q4	udr	Deferred Tax Assets Depreciation DeferredTaxAssetsDepreciation	10045000	USD
CY2010Q4	udr	Deferred Tax Assets Federal And State Tax Attributes DeferredTaxAssetsFederalAndStateTaxAttributes	33053000	USD
CY2011Q4	udr	Deferred Tax Assets Federal And State Tax Attributes DeferredTaxAssetsFederalAndStateTaxAttributes	24524000	USD
CY2012Q4	udr	Deferred Tax Assets Federal And State Tax Attributes DeferredTaxAssetsFederalAndStateTaxAttributes	1464000	USD
CY2012	udr	Development Costs Excluding Direct Costs And Capitlized Interest DevelopmentCostsExcludingDirectCostsAndCapitlizedInterest	10000000	USD
CY2010	udr	Development Costs Excluding Direct Costs And Capitlized Interest DevelopmentCostsExcludingDirectCostsAndCapitlizedInterest	8500000	USD
CY2010	udr	Discontinued Operations Apartment Homes Sold DiscontinuedOperationsApartmentHomesSold	149	Apartment_Homes
CY2011	udr	Discontinued Operations Apartment Homes Sold DiscontinuedOperationsApartmentHomesSold	4488	Apartment_Homes
CY2012	udr	Discontinued Operations Apartment Homes Sold DiscontinuedOperationsApartmentHomesSold	6507	Apartment_Homes
CY2011	udr	Discontinued Operations Communities Sold DiscontinuedOperationsCommunitiesSold	18	Communities
CY2010	udr	Discontinued Operations Communities Sold DiscontinuedOperationsCommunitiesSold	1	Communities
CY2012	udr	Discontinued Operations Communities Sold DiscontinuedOperationsCommunitiesSold	21	Communities
CY2012	udr	Disposal Group Including Discontinued Operation Non Property Expense DisposalGroupIncludingDiscontinuedOperationNonPropertyExpense	791000	USD
CY2011	udr	Disposal Group Including Discontinued Operation Non Property Expense DisposalGroupIncludingDiscontinuedOperationNonPropertyExpense	227000	USD
CY2010	udr	Disposal Group Including Discontinued Operation Non Property Expense DisposalGroupIncludingDiscontinuedOperationNonPropertyExpense	75000	USD
CY2011	udr	Disposal Group Including Discontinued Operation Non Property Income DisposalGroupIncludingDiscontinuedOperationNonPropertyIncome	0	USD
CY2010	udr	Disposal Group Including Discontinued Operation Non Property Income DisposalGroupIncludingDiscontinuedOperationNonPropertyIncome	1845000	USD
CY2012	udr	Disposal Group Including Discontinued Operation Non Property Income DisposalGroupIncludingDiscontinuedOperationNonPropertyIncome	0	USD
CY2012	udr	Disposal Group Including Discontinued Operation Property Management Fee DisposalGroupIncludingDiscontinuedOperationPropertyManagementFee	834000	USD
CY2011	udr	Disposal Group Including Discontinued Operation Property Management Fee DisposalGroupIncludingDiscontinuedOperationPropertyManagementFee	2970000	USD
CY2010	udr	Disposal Group Including Discontinued Operation Property Management Fee DisposalGroupIncludingDiscontinuedOperationPropertyManagementFee	3337000	USD
CY2010	udr	Disposal Group Including Discontinued Operation Real Estate Depreciation DisposalGroupIncludingDiscontinuedOperationRealEstateDepreciation	57858000	USD
CY2011	udr	Disposal Group Including Discontinued Operation Real Estate Depreciation DisposalGroupIncludingDiscontinuedOperationRealEstateDepreciation	43555000	USD
CY2012	udr	Disposal Group Including Discontinued Operation Real Estate Depreciation DisposalGroupIncludingDiscontinuedOperationRealEstateDepreciation	6340000	USD
CY2012	udr	Disposal Group Including Discontinued Operation Rental Expenses DisposalGroupIncludingDiscontinuedOperationRentalExpenses	10566000	USD
CY2011	udr	Disposal Group Including Discontinued Operation Rental Expenses DisposalGroupIncludingDiscontinuedOperationRentalExpenses	40724000	USD
CY2011	udr	Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Consideration Issued Value NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationIssuedValue	111034000	USD
CY2010	udr	Disposal Group Including Discontinued Operation Rental Expenses DisposalGroupIncludingDiscontinuedOperationRentalExpenses	47296000	USD
CY2011	udr	Distributions To Redeemable Noncontrolling Interests In Operating Partnership DistributionsToRedeemableNoncontrollingInterestsInOperatingPartnership	7298000	USD
CY2012	udr	Distributions To Redeemable Noncontrolling Interests In Operating Partnership DistributionsToRedeemableNoncontrollingInterestsInOperatingPartnership	9202000	USD
CY2012Q4	udr	Expected Costs To Complete ExpectedCostsToComplete	606834000	USD
CY2010	udr	Fair Value Adjustment Of Debt Assumed In Business Acquisition FairValueAdjustmentOfDebtAssumedInBusinessAcquisition	1820000	USD
CY2011	udr	Fair Value Adjustment Of Debt Assumed In Business Acquisition FairValueAdjustmentOfDebtAssumedInBusinessAcquisition	26880000	USD
CY2012	udr	Fair Value Adjustment Of Debt Assumed In Business Acquisition FairValueAdjustmentOfDebtAssumedInBusinessAcquisition	2617000	USD
CY2011Q4	udr	Fair Value Of Underlying Property FairValueOfUnderlyingProperty	9800000	USD
CY2011Q4	udr	Fair Value Of Underlying Property Upon Completion Of Entitlement Process FairValueOfUnderlyingPropertyUponCompletionOfEntitlementProcess	12800000	USD
CY2010	udr	Federal Income Tax Expense Benefit FederalIncomeTaxExpenseBenefit	-16006000	USD
CY2012	udr	Federal Income Tax Expense Benefit FederalIncomeTaxExpenseBenefit	21853000	USD
CY2011	udr	Federal Income Tax Expense Benefit FederalIncomeTaxExpenseBenefit	11715000	USD
CY2011Q4	udr	General Partners Capital Account Units Owned Percentage GeneralPartnersCapitalAccountUnitsOwnedPercentage	0.949
CY2012Q4	udr	General Partners Capital Account Units Owned Percentage GeneralPartnersCapitalAccountUnitsOwnedPercentage	0.949
CY2012	udr	Income Tax Expense Benefit Continuing Operations Change In Valuation Allowance IncomeTaxExpenseBenefitContinuingOperationsChangeInValuationAllowance	-45800000	USD
CY2012	udr	Income Tax Expense Benefit Of Reit Subsidiary Net Including Discontinued Operations IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations	-21076000	USD
CY2010	udr	Income Tax Expense Benefit Of Reit Subsidiary Net Including Discontinued Operations IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations	-2533000	USD
CY2011	udr	Income Tax Expense Benefit Of Reit Subsidiary Net Including Discontinued Operations IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations	7571000	USD
CY2012	udr	Initial Term Of Credit Facilities InitialTermOfCreditFacilities	P10Y
CY2012Q4	udr	Joint Venture Number Of Apartment Homes In Operating Communities JointVentureNumberOfApartmentHomesInOperatingCommunities	9558	Apartment_Homes
CY2012	udr	Limited Partners Capital Account Units Redeemed For Cash LimitedPartnersCapitalAccountUnitsRedeemedForCash	0	shares
CY2010	udr	Limited Partners Capital Account Units Redeemed For Cash LimitedPartnersCapitalAccountUnitsRedeemedForCash	0	shares
CY2011	udr	Maximum Number Of Days Within Which Criteria Is To Met MaximumNumberOfDaysWithinWhichCriteriaIsToMet	P730D
CY2010	udr	Minimum Percentage Of Carrying Value Of Real Estate Portfolio Held By Company MinimumPercentageOfCarryingValueOfRealEstatePortfolioHeldByCompany	0.10
CY2010	udr	Noncash Consideration To Acquire Non Real Estate Asset NoncashConsiderationToAcquireNonRealEstateAsset	0	USD
CY2012	udr	Noncash Consideration To Acquire Non Real Estate Asset NoncashConsiderationToAcquireNonRealEstateAsset	0	USD
CY2011	udr	Noncash Consideration To Acquire Non Real Estate Asset NoncashConsiderationToAcquireNonRealEstateAsset	6864000	USD
CY2012	udr	Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Consideration Issued Value NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationIssuedValue	0	USD
CY2010	udr	Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Consideration Issued Value NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationIssuedValue	0	USD
CY2012Q4	udr	Noncontrolling Interest Ownership Percentage Purchased NoncontrollingInterestOwnershipPercentagePurchased	0.10
CY2011	udr	Number Of Apartment Homes Acquired NumberOfApartmentHomesAcquired	3161	Apartment_Homes
CY2010	udr	Number Of Apartment Homes Acquired NumberOfApartmentHomesAcquired	1374	Apartment_Homes
CY2012Q4	udr	Number Of Apartment Homes Acquired NumberOfApartmentHomesAcquired	0	Apartment_Homes
CY2012	udr	Number Of Apartment Homes Acquired NumberOfApartmentHomesAcquired	0	Apartment_Homes
CY2012Q4	udr	Number Of Apartment Homes Owned And Consolidated By Company NumberOfApartmentHomesOwnedAndConsolidatedByCompany	41571	Apartment_Homes
CY2012	udr	Number Of Communities Acquired Apartment Homes Are Within NumberOfCommunitiesAcquiredApartmentHomesAreWithin	0	Communities
CY2012Q4	udr	Number Of Communities Acquired Apartment Homes Are Within NumberOfCommunitiesAcquiredApartmentHomesAreWithin	0	Communities
CY2012Q4	udr	Number Of Dilutive Instruments NumberOfDilutiveInstruments	0
CY2011	udr	Number Of Land Parcels Acquired NumberOfLandParcelsAcquired	3	Land_Parcels
CY2010	udr	Number Of Land Parcels Acquired NumberOfLandParcelsAcquired	1	Land_Parcels
CY2012Q4	udr	Number Of Markets Operating Within NumberOfMarketsOperatingWithin	22	Markets
CY2011	udr	Number Of Operating Communities Acquired NumberOfOperatingCommunitiesAcquired	8	Communities
CY2010	udr	Number Of Operating Communities Acquired NumberOfOperatingCommunitiesAcquired	5	Communities
CY2012Q4	udr	Number Of Owned And Consolidated Community NumberOfOwnedAndConsolidatedCommunity	145	Communities
CY2012Q4	udr	Number Of States In Which There Are Owned And Consolidated Communities NumberOfStatesInWhichThereAreOwnedAndConsolidatedCommunities	10	States
CY2012	udr	Numberofapartmenthomesinitiallycontributed Numberofapartmenthomesinitiallycontributed	3992	Apartment_Homes
CY2012	udr	Numberofpropertiesinitiallycontributedtojointventure Numberofpropertiesinitiallycontributedtojointventure	10	property
CY2012Q4	udr	Operating Partnership Units Issued For Partial Consideration In Community Acquisition OperatingPartnershipUnitsIssuedForPartialConsiderationInCommunityAcquisition	0	USD
CY2011	udr	Operating Partnership Units Issued For Partial Consideration In Community Acquisition OperatingPartnershipUnitsIssuedForPartialConsiderationInCommunityAcquisition	111034000	USD
CY2010	udr	Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-3471000	USD
CY2011	udr	Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-10433000	USD
CY2012	udr	Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2645000	USD
CY2010	udr	Other Cost And Expense Operating Including Discontinued Operations OtherCostAndExpenseOperatingIncludingDiscontinuedOperations	5848000	USD
CY2011	udr	Other Cost And Expense Operating Including Discontinued Operations OtherCostAndExpenseOperatingIncludingDiscontinuedOperations	6217000	USD
CY2012	udr	Other Cost And Expense Operating Including Discontinued Operations OtherCostAndExpenseOperatingIncludingDiscontinuedOperations	5748000	USD
CY2010	udr	Other General And Administrative Expense Including Discontinued Operations OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations	45243000	USD
CY2011	udr	Other General And Administrative Expense Including Discontinued Operations OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations	45915000	USD
CY2012	udr	Other General And Administrative Expense Including Discontinued Operations OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations	43494000	USD
CY2010	udr	Other Income Tax Expense Benefit OtherIncomeTaxExpenseBenefit	-5100000	USD
CY2012	udr	Other Income Tax Expense Benefit OtherIncomeTaxExpenseBenefit	-1682000	USD
CY2011	udr	Other Income Tax Expense Benefit OtherIncomeTaxExpenseBenefit	1227000	USD
CY2012	udr	Other Operating Income Inclusive Of Discontinued Operations OtherOperatingIncomeInclusiveOfDiscontinuedOperations	15435000	USD
CY2011	udr	Other Operating Income Inclusive Of Discontinued Operations OtherOperatingIncomeInclusiveOfDiscontinuedOperations	17422000	USD
CY2010	udr	Other Operating Income Inclusive Of Discontinued Operations OtherOperatingIncomeInclusiveOfDiscontinuedOperations	14347000	USD
CY2012	udr	Ownership Of Consolidated Joint Ventures OwnershipOfConsolidatedJointVentures	less than 100%
CY2010	udr	Payment For Redemption Of Operating Partnership Unit PaymentForRedemptionOfOperatingPartnershipUnit	0	USD
CY2012	udr	Payment For Redemption Of Operating Partnership Unit PaymentForRedemptionOfOperatingPartnershipUnit	133000	USD
CY2011	udr	Payment For Redemption Of Operating Partnership Unit PaymentForRedemptionOfOperatingPartnershipUnit	0	USD
CY2012	udr	Percentage Distribution For Not Subject To Domestic Federal Income Tax PercentageDistributionForNotSubjectToDomesticFederalIncomeTax	0.90
CY2011	udr	Purchase Price Of Acquired Operating Communities PurchasePriceOfAcquiredOperatingCommunities	1500000000	USD
CY2010	udr	Purchase Price Of Acquired Operating Communities PurchasePriceOfAcquiredOperatingCommunities	412000000	USD
CY2011	udr	Real Estate Impairment Amount Accumulated Depreciation RealEstateImpairmentAmountAccumulatedDepreciation	0	USD
CY2012	udr	Real Estate Impairment Amount Accumulated Depreciation RealEstateImpairmentAmountAccumulatedDepreciation	-693000	USD
CY2010	udr	Real Estate Impairment Amount Accumulated Depreciation RealEstateImpairmentAmountAccumulatedDepreciation	0	USD
CY2010	udr	Real Estate Impairment Amount Gross RealEstateImpairmentAmountGross	0	USD
CY2012	udr	Real Estate Impairment Amount Gross RealEstateImpairmentAmountGross	-9672000	USD
CY2011	udr	Real Estate Impairment Amount Gross RealEstateImpairmentAmountGross	0	USD
CY2012Q4	udr	Real Estate Net RealEstateNet	6131146000	USD
CY2011Q4	udr	Real Estate Net RealEstateNet	6242744000	USD
CY2012Q4	udr	Real Estate Owned Gross RealEstateOwnedGross	8055828000	USD
CY2011Q4	udr	Real Estate Owned Gross RealEstateOwnedGross	8074471000	USD
CY2012Q4	udr	Real Estate Under Development Accumulated Depreciation RealEstateUnderDevelopmentAccumulatedDepreciation	1253000	USD
CY2011Q4	udr	Real Estate Under Development Accumulated Depreciation RealEstateUnderDevelopmentAccumulatedDepreciation	570000	USD
CY2011Q4	udr	Real Estates Owned Accumulated Depreciation RealEstatesOwnedAccumulatedDepreciation	1831727000	USD
CY2012Q4	udr	Real Estates Owned Accumulated Depreciation RealEstatesOwnedAccumulatedDepreciation	1924682000	USD
CY2012	udr	Related Party Transaction Management Fees RelatedPartyTransactionManagementFees	11900000	USD
CY2011	udr	Related Party Transaction Management Fees RelatedPartyTransactionManagementFees	3700000	USD
CY2012	udr	Retirement Of Fully Depreciated Assets RetirementOfFullyDepreciatedAssets	0	USD
CY2011	udr	Retirement Of Fully Depreciated Assets RetirementOfFullyDepreciatedAssets	0	USD
CY2010	udr	Retirement Of Fully Depreciated Assets RetirementOfFullyDepreciatedAssets	8680000	USD
CY2012Q4	udr	Secured Debt Encumbers Real Estate Owned Amount SecuredDebtEncumbersRealEstateOwnedAmount	2300000000	USD
CY2011Q4	udr	Secured Debt Encumbers Real Estate Owned Amount SecuredDebtEncumbersRealEstateOwnedAmount	2300000000	USD
CY2012Q4	udr	Secured Debt Encumbers Real Estate Owned Percent SecuredDebtEncumbersRealEstateOwnedPercent	0.288
CY2011Q4	udr	Secured Debt Encumbers Real Estate Owned Percent SecuredDebtEncumbersRealEstateOwnedPercent	0.288
CY2012Q4	udr	Secured Debt Unencumbered Real Estate Owned Amount SecuredDebtUnencumberedRealEstateOwnedAmount	5700000000	USD
CY2011Q4	udr	Secured Debt Unencumbered Real Estate Owned Amount SecuredDebtUnencumberedRealEstateOwnedAmount	5700000000	USD
CY2012Q4	udr	Secured Debt Unencumbered Real Estate Owned Percent SecuredDebtUnencumberedRealEstateOwnedPercent	0.712
CY2011Q4	udr	Secured Debt Unencumbered Real Estate Owned Percent SecuredDebtUnencumberedRealEstateOwnedPercent	0.712
CY2012Q4	udr	Security Deposits And Prepaid Rent SecurityDepositsAndPrepaidRent	42589000	USD
CY2011Q4	udr	Security Deposits And Prepaid Rent SecurityDepositsAndPrepaidRent	35516000	USD
CY2012	udr	Segment Reporting Information Net Operating Income SegmentReportingInformationNetOperatingIncome	504200000	USD
CY2010	udr	Segment Reporting Information Net Operating Income SegmentReportingInformationNetOperatingIncome	411064000	USD
CY2011	udr	Segment Reporting Information Net Operating Income SegmentReportingInformationNetOperatingIncome	484760000	USD
CY2011	udr	Segment Reporting Reconciling Items Cost Of Services Depreciation And Amortization SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization	370343000	USD
CY2010	udr	Segment Reporting Reconciling Items Cost Of Services Depreciation And Amortization SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization	303446000	USD
CY2012	udr	Segment Reporting Reconciling Items Cost Of Services Depreciation And Amortization SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization	350400000	USD
CY2010	udr	Segment Reporting Reconciling Items Gain Loss On Sale Of Property SegmentReportingReconcilingItemsGainLossOnSaleOfProperty	4083000	USD
CY2011	udr	Segment Reporting Reconciling Items Gain Loss On Sale Of Property SegmentReportingReconcilingItemsGainLossOnSaleOfProperty	138508000	USD
CY2012	udr	Segment Reporting Reconciling Items Gain Loss On Sale Of Property SegmentReportingReconcilingItemsGainLossOnSaleOfProperty	260404000	USD
CY2012	udr	Segment Reporting Reconciling Items Interest Income Expense Net SegmentReportingReconcilingItemsInterestIncomeExpenseNet	-138792000	USD
CY2011	udr	Segment Reporting Reconciling Items Interest Income Expense Net SegmentReportingReconcilingItemsInterestIncomeExpenseNet	-158333000	USD
CY2010	udr	Segment Reporting Reconciling Items Interest Income Expense Net SegmentReportingReconcilingItemsInterestIncomeExpenseNet	-150796000	USD
CY2012	udr	Segment Reporting Reconciling Items Owned Property Management Costs SegmentReportingReconcilingItemsOwnedPropertyManagementCosts	20466000	USD
CY2010	udr	Segment Reporting Reconciling Items Owned Property Management Costs SegmentReportingReconcilingItemsOwnedPropertyManagementCosts	17432000	USD
CY2011	udr	Segment Reporting Reconciling Items Owned Property Management Costs SegmentReportingReconcilingItemsOwnedPropertyManagementCosts	20101000	USD
CY2012	udr	Shares Of Common Stock Issued Related To Exercise Of Stock Options SharesOfCommonStockIssuedRelatedToExerciseOfStockOptions	182204	shares
CY2012	udr	Shares Reserved For Issuance Under Stock Purchase Plan SharesReservedForIssuanceUnderStockPurchasePlan	11541046	shares
CY2012	udr	State And Local Income Tax Expense Benefit StateAndLocalIncomeTaxExpenseBenefit	2497000	USD
CY2010	udr	State And Local Income Tax Expense Benefit StateAndLocalIncomeTaxExpenseBenefit	19000	USD
CY2011	udr	State And Local Income Tax Expense Benefit StateAndLocalIncomeTaxExpenseBenefit	2099000	USD
CY2012	udr	Stock Issued During Period Shares Under At Market Equity Distribution Program StockIssuedDuringPeriodSharesUnderAtMarketEquityDistributionProgram	8640969	shares
CY2012	udr	Stock Issued During Period Shares Under Underwritten Public Offering StockIssuedDuringPeriodSharesUnderUnderwrittenPublicOffering	21850000	shares
CY2012	udr	Stock Issued During Period Value Under At Market Equity Distrtibution Program StockIssuedDuringPeriodValueUnderAtMarketEquityDistrtibutionProgram	217600000	USD
CY2012	udr	Stock Issued During Period Value Under Underwritten Public Offering StockIssuedDuringPeriodValueUnderUnderwrittenPublicOffering	538800000	USD
CY2011	udr	Tax Benefit Of Taxable Subsidiary TaxBenefitOfTaxableSubsidiary	5647000	USD
CY2010	udr	Tax Benefit Of Taxable Subsidiary TaxBenefitOfTaxableSubsidiary	2533000	USD
CY2012	udr	Tax Benefit Of Taxable Subsidiary TaxBenefitOfTaxableSubsidiary	30282000	USD
CY2011	udr	Taxable Distributions Paid Per Common Share Long Term Capital Gain TaxableDistributionsPaidPerCommonShareLongTermCapitalGain	0.07
CY2010	udr	Taxable Distributions Paid Per Common Share Long Term Capital Gain TaxableDistributionsPaidPerCommonShareLongTermCapitalGain	0.03
CY2012	udr	Taxable Distributions Paid Per Common Share Long Term Capital Gain TaxableDistributionsPaidPerCommonShareLongTermCapitalGain	0.19
CY2011	udr	Taxable Distributions Paid Per Common Share Ordinary Income TaxableDistributionsPaidPerCommonShareOrdinaryIncome	0.49
CY2012	udr	Taxable Distributions Paid Per Common Share Ordinary Income TaxableDistributionsPaidPerCommonShareOrdinaryIncome	0.17
CY2010	udr	Taxable Distributions Paid Per Common Share Ordinary Income TaxableDistributionsPaidPerCommonShareOrdinaryIncome	0.69
CY2012	udr	Taxable Distributions Paid Per Common Share Unrecapture Section Gain TaxableDistributionsPaidPerCommonShareUnrecaptureSectionGain	0.51
CY2010	udr	Taxable Distributions Paid Per Common Share Unrecapture Section Gain TaxableDistributionsPaidPerCommonShareUnrecaptureSectionGain	0.01
CY2011	udr	Taxable Distributions Paid Per Common Share Unrecapture Section Gain TaxableDistributionsPaidPerCommonShareUnrecaptureSectionGain	0.21
CY2012	udr	Tenant Or Related Group Of Tenants Contributed Ten Percent Or More Of Company Revenue TenantOrRelatedGroupOfTenantsContributedTenPercentOrMoreOfCompanyRevenue	0
CY2011	udr	Tenant Or Related Group Of Tenants Contributed Ten Percent Or More Of Company Revenue TenantOrRelatedGroupOfTenantsContributedTenPercentOrMoreOfCompanyRevenue	0
CY2010	udr	Tenant Or Related Group Of Tenants Contributed Ten Percent Or More Of Company Revenue TenantOrRelatedGroupOfTenantsContributedTenPercentOrMoreOfCompanyRevenue	0
CY2012	udr	Valuation Allowance Deferred Tax Asset Change In Amount Due To Reassessment ValuationAllowanceDeferredTaxAssetChangeInAmountDueToReassessment	-44400000	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000074208
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	250179737	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	4400000000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	UDR, Inc.
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	udr	Business Interruption Costs BusinessInterruptionCosts	4400000	USD

Files In Submission

Name	View Source	Status
0000074208-13-000007-index-headers.html	Edgar Link	pending
0000074208-13-000007-index.html	Edgar Link	pending
0000074208-13-000007.txt	Edgar Link	pending
0000074208-13-000007-xbrl.zip	Edgar Link	pending
exhibit-1003.htm	Edgar Link	pending
exhibit1043.htm	Edgar Link	pending
exhibit1044.htm	Edgar Link	pending
exhibit121.htm	Edgar Link	pending
exhibit122.htm	Edgar Link	pending
exhibit21.htm	Edgar Link	pending
exhibit231.htm	Edgar Link	pending
exhibit232.htm	Edgar Link	pending
exhibit311.htm	Edgar Link	pending
exhibit312.htm	Edgar Link	pending
exhibit313.htm	Edgar Link	pending
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exhibit321.htm	Edgar Link	pending
exhibit322.htm	Edgar Link	pending
exhibit323.htm	Edgar Link	pending
exhibit324.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
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R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
udr-20121231.xml	Edgar Link	completed
udr-20121231.xsd	Edgar Link	pending
udr-20121231x10k.htm	Edgar Link	pending
udr-20121231_cal.xml	Edgar Link	unprocessable
udr-20121231_def.xml	Edgar Link	unprocessable
udr-20121231_lab.xml	Edgar Link	unprocessable
udr-20121231_pre.xml	Edgar Link	unprocessable
udr20121231-10kchart.jpg	Edgar Link	pending

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$UDR
UDR, Inc. Stock $udr

2012 Q4 Form 10-K Financial Statement

#000007420813000007 Filed on February 27, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$UDR UDR, Inc. Stock $udr

2012 Q4 Form 10-K Financial Statement

#000007420813000007 Filed on February 27, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$UDR
UDR, Inc. Stock $udr