$NSP
INSPERITY, INC. Stock $nsp

$nsp Overview Financials Valuation SEC Filings Company Website

2015 Form 10-K Financial Statement

#000100075316000075 Filed on February 12, 2016

Income Statement

Concept	2015	2014 Q4	2014 Q3
Revenue	$2.604B	$595.9M	$560.3M
YoY Change	10.43%	6.95%	3.78%
Cost Of Revenue	$2.166B	$494.5M	$459.5M
YoY Change	10.83%	5.84%	3.84%
Gross Profit	$437.9M	$101.4M	$100.8M
YoY Change	8.44%	12.65%	3.5%
Gross Profit Margin	16.82%	17.01%	17.99%
Selling, General & Admin	$343.1M	$81.60M	$81.10M
YoY Change	3.56%	9.68%	8.13%
% of Gross Profit	78.36%	80.51%	80.44%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$18.57M	$5.600M	$5.300M
YoY Change	-13.19%	5.66%	0.0%
% of Gross Profit	4.24%	5.52%	5.26%
Operating Expenses	$372.2M	$87.20M	$86.36M
YoY Change	4.44%	9.27%	7.55%
Operating Profit	$65.70M	$13.01M	$14.46M
YoY Change	38.39%	89.25%	-15.5%
Interest Expense	$459.0K	$100.0K	$9.000K
YoY Change	24.05%		-65.38%
% of Operating Profit	0.7%	0.77%	0.06%
Other Income/Expense, Net	-$113.0K		$34.00K
YoY Change	-340.43%		-3500.0%
Pretax Income	$65.62M	$13.10M	$14.50M
YoY Change	37.78%	89.86%	-15.37%
Income Tax	$26.23M	$4.900M	$6.118M
% Of Pretax Income	39.97%	37.4%	42.18%
Net Earnings	$39.39M	$8.164M	$8.385M
YoY Change	40.66%	54.36%	-16.83%
Net Earnings / Revenue	1.51%	1.37%	1.5%
Basic Earnings Per Share	$0.79	$0.27	$0.33
Diluted Earnings Per Share	$0.79	$0.27	$0.33
COMMON SHARES
Basic Shares Outstanding	48.62M shares	25.33M shares	24.65M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2015	2014 Q4	2014 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$279.4M	$305.1M	$225.4M
YoY Change	-8.42%	12.13%	7.74%
Cash & Equivalents	$269.5M	$276.5M	$179.5M
Short-Term Investments	$9.900M	$28.60M	$46.00M
Other Short-Term Assets	$62.00M	$17.65M	$12.85M
YoY Change	-25.3%	46.43%	27.28%
Inventory
Prepaid Expenses
Receivables	$53.50M	$12.01M	$3.730M
Other Receivables	$147.2M	$2.900M	$6.100M
Total Short-Term Assets	$542.0M	$563.2M	$573.7M
YoY Change	-3.76%	-0.38%	12.61%
LONG-TERM ASSETS
Property, Plant & Equipment	$61.80M	$84.35M	$82.77M
YoY Change	-26.69%	-2.4%	-7.05%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$167.5M	$1.725M	$1.748M
YoY Change	28.25%	-5.01%	-8.96%
Total Long-Term Assets	$242.9M	$229.4M	$205.7M
YoY Change	5.88%	13.99%	2.32%
TOTAL ASSETS
Total Short-Term Assets	$542.0M	$563.2M	$573.7M
Total Long-Term Assets	$242.9M	$229.4M	$205.7M
Total Assets	$784.9M	$792.6M	$779.4M
YoY Change	-0.97%	3.4%	9.7%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$5.400M	$4.674M	$3.255M
YoY Change	14.89%	74.53%	-1.69%
Accrued Expenses	$479.4M	$22.44M	$23.01M
YoY Change	-1.7%	50.03%	47.86%
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	$487.7M	$496.5M	$454.5M
YoY Change	-1.77%	13.69%	17.55%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$124.7M	$92.00M	$73.00M
YoY Change	35.54%	33.53%	9.45%
Total Long-Term Liabilities	$124.7M	$92.05M	$76.82M
YoY Change	35.54%	20.17%	2.35%
TOTAL LIABILITIES
Total Short-Term Liabilities	$487.7M	$496.5M	$454.5M
Total Long-Term Liabilities	$124.7M	$92.05M	$76.82M
Total Liabilities	$612.5M	$588.5M	$531.4M
YoY Change	4.08%	14.65%	15.08%
SHAREHOLDERS EQUITY
Retained Earnings		$214.5M	$261.8M
YoY Change		-16.21%	2.65%
Common Stock		$138.1M	$137.3M
YoY Change		1.56%	1.62%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$148.5M	$151.1M
YoY Change		7.05%	6.85%
Treasury Stock Shares		5.425M shares
Shareholders Equity	$172.5M	$204.1M	$248.0M
YoY Change
Total Liabilities & Shareholders Equity	$784.9M	$792.6M	$779.4M
YoY Change	-0.97%	3.4%	9.7%

Cashflow Statement

Concept	2015	2014 Q4	2014 Q3
OPERATING ACTIVITIES
Net Income	$39.39M	$8.164M	$8.385M
YoY Change	40.66%	54.36%	-16.83%
Depreciation, Depletion And Amortization	$18.57M	$5.600M	$5.300M
YoY Change	-13.19%	5.66%	0.0%
Cash From Operating Activities	$65.08M	$142.7M	$28.40M
YoY Change	-54.07%	106.51%	-313.53%
INVESTING ACTIVITIES
Capital Expenditures	$17.84M	-$8.100M	-$4.400M
YoY Change	-6.69%	252.17%	62.96%
Acquisitions
YoY Change
Other Investing Activities	$30.20M	$17.00M	-$3.000M
YoY Change	89.94%	2733.33%	-163.83%
Cash From Investing Activities	$12.37M	$8.900M	-$7.400M
YoY Change	-485.9%	-656.25%	-452.38%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$84.37M	-54.60M	-10.40M
YoY Change	-3.91%	1505.88%	85.71%
NET CHANGE
Cash From Operating Activities	$65.08M	142.7M	28.40M
Cash From Investing Activities	$12.37M	8.900M	-7.400M
Cash From Financing Activities	-$84.37M	-54.60M	-10.40M
Net Change In Cash	-$6.918M	97.00M	10.60M
YoY Change	-113.64%	51.33%	-163.1%
FREE CASH FLOW
Cash From Operating Activities	$65.08M	$142.7M	$28.40M
Capital Expenditures	$17.84M	-$8.100M	-$4.400M
Free Cash Flow	$47.24M	$150.8M	$32.80M
YoY Change	-61.47%	111.2%	-409.43%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2015	dei	Amendment Flag AmendmentFlag	false
CY2015	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2015	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2015	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
CY2015	dei	Document Period End Date DocumentPeriodEndDate	2015-12-31
CY2015	dei	Document Type DocumentType	10-K
CY2015	dei	Entity Central Index Key EntityCentralIndexKey	0001000753
CY2016Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	21257515	shares
CY2015	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2015	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2015Q2	dei	Entity Public Float EntityPublicFloat	966000000	USD
CY2015	dei	Entity Registrant Name EntityRegistrantName	INSPERITY, INC.
CY2015	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2015	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2015	nsp	Accounts Receivable Due Date Prior To Applicable Payroll Date AccountsReceivableDueDatePriorToApplicablePayrollDate	P1D
CY2014Q4	nsp	Accrued Corporate Payroll And Commissions Earned AccruedCorporatePayrollAndCommissionsEarned	32644000	USD
CY2015Q4	nsp	Accrued Corporate Payroll And Commissions Earned AccruedCorporatePayrollAndCommissionsEarned	39103000	USD
CY2013	nsp	Accrued Corporate Payroll Commissions And Other Accrued Liabilities AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities	556000	USD
CY2014	nsp	Accrued Corporate Payroll Commissions And Other Accrued Liabilities AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities	18517000	USD
CY2015	nsp	Accrued Corporate Payroll Commissions And Other Accrued Liabilities AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities	4105000	USD
CY2014Q4	nsp	Accrued Health Insurance Costs AccruedHealthInsuranceCosts	18329000	USD
CY2015Q4	nsp	Accrued Health Insurance Costs AccruedHealthInsuranceCosts	13643000	USD
CY2014Q4	nsp	Accrued Payroll Taxes And Other Payroll Deductions Current AccruedPayrollTaxesAndOtherPayrollDeductionsCurrent	176341000	USD
CY2015Q4	nsp	Accrued Payroll Taxes And Other Payroll Deductions Current AccruedPayrollTaxesAndOtherPayrollDeductionsCurrent	205393000	USD
CY2014Q4	nsp	Accrued Worksite Employee Payroll Costs AccruedWorksiteEmployeePayrollCosts	192396000	USD
CY2015Q4	nsp	Accrued Worksite Employee Payroll Costs AccruedWorksiteEmployeePayrollCosts	161917000	USD
CY2015	nsp	Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles	0	USD
CY2013	nsp	Adjusted Weighted Average Common Shares Outstanding AdjustedWeightedAverageCommonSharesOutstanding	24872000	shares
CY2014	nsp	Adjusted Weighted Average Common Shares Outstanding AdjustedWeightedAverageCommonSharesOutstanding	24712000	shares
CY2015	nsp	Adjusted Weighted Average Common Shares Outstanding AdjustedWeightedAverageCommonSharesOutstanding	24315000	shares
CY2015Q4	nsp	Applicable Margin30 Day Libor ApplicableMargin30DayLibor	0.0200
CY2015Q4	nsp	Applicable Margin Federal Funds Rate ApplicableMarginFederalFundsRate	0.0050
CY2014Q4	nsp	Cash Equivalents And Marketable Securities At Carrying Value CashEquivalentsAndMarketableSecuritiesAtCarryingValue	314596000	USD
CY2015Q4	nsp	Cash Equivalents And Marketable Securities At Carrying Value CashEquivalentsAndMarketableSecuritiesAtCarryingValue	283643000	USD
CY2014Q4	nsp	Cash Held In Demand Accounts CashHeldInDemandAccounts	20369000	USD
CY2015Q4	nsp	Cash Held In Demand Accounts CashHeldInDemandAccounts	19377000	USD
CY2015	nsp	Common Stock Purchase Right Per Preferred Stock Share CommonStockPurchaseRightPerPreferredStockShare	1	shares
CY2014Q4	nsp	Computer Hardware And Software ComputerHardwareAndSoftware	89204000	USD
CY2015Q4	nsp	Computer Hardware And Software ComputerHardwareAndSoftware	90654000	USD
CY2014	nsp	Decrease Increase In Accrued Workers Compensation Costs For Changes In Estimated Losses DecreaseIncreaseInAccruedWorkersCompensationCostsForChangesInEstimatedLosses	2900000	USD
CY2015	nsp	Decrease Increase In Accrued Workers Compensation Costs For Changes In Estimated Losses DecreaseIncreaseInAccruedWorkersCompensationCostsForChangesInEstimatedLosses	1300000	USD
CY2014Q4	nsp	Deposits Health Insurance DepositsHealthInsurance	3700000	USD
CY2015Q4	nsp	Deposits Health Insurance DepositsHealthInsurance	3700000	USD
CY2014Q4	nsp	Deposits Workers Compensation DepositsWorkersCompensation	113934000	USD
CY2015Q4	nsp	Deposits Workers Compensation DepositsWorkersCompensation	136462000	USD
CY2015	nsp	Future Non Cancelable Purchase And Service Obligations Disclosure Threshold FutureNonCancelablePurchaseAndServiceObligationsDisclosureThreshold	greater than $100,000 and one year
CY2014Q4	nsp	Goodwill And Other Intangible Assets Net GoodwillAndOtherIntangibleAssetsNet	14457000	USD
CY2015Q4	nsp	Goodwill And Other Intangible Assets Net GoodwillAndOtherIntangibleAssetsNet	13588000	USD
CY2015	nsp	Goodwilland Other Intangibles Impairment GoodwillandOtherIntangiblesImpairment	0	USD
CY2015	nsp	Goodwilland Other Intangibles Impairmentgross GoodwillandOtherIntangiblesImpairmentgross	0	USD
CY2013	nsp	Gross Billings GrossBillings	13462000000	USD
CY2014	nsp	Gross Billings GrossBillings	14187000000	USD
CY2015	nsp	Gross Billings GrossBillings	15806000000	USD
CY2013	nsp	Increase Decrease In Restricted Cash Net From Acquisitions IncreaseDecreaseInRestrictedCashNetFromAcquisitions	4779000	USD
CY2014	nsp	Increase Decrease In Restricted Cash Net From Acquisitions IncreaseDecreaseInRestrictedCashNetFromAcquisitions	-7888000	USD
CY2015	nsp	Increase Decrease In Restricted Cash Net From Acquisitions IncreaseDecreaseInRestrictedCashNetFromAcquisitions	-6622000	USD
CY2013	nsp	Incremental Shares From Assumed Conversions Of Common Stock Options IncrementalSharesFromAssumedConversionsOfCommonStockOptions	22000	shares
CY2014	nsp	Incremental Shares From Assumed Conversions Of Common Stock Options IncrementalSharesFromAssumedConversionsOfCommonStockOptions	4000	shares
CY2015	nsp	Incremental Shares From Assumed Conversions Of Common Stock Options IncrementalSharesFromAssumedConversionsOfCommonStockOptions	7000	shares
CY2013	nsp	Marketable Securities Proceeds From Dispositions MarketableSecuritiesProceedsFromDispositions	8026000	USD
CY2014	nsp	Marketable Securities Proceeds From Dispositions MarketableSecuritiesProceedsFromDispositions	56880000	USD
CY2015	nsp	Marketable Securities Proceeds From Dispositions MarketableSecuritiesProceedsFromDispositions	17869000	USD
CY2014Q4	nsp	Money Market Funds Overnight Holdings At Carrying Value MoneyMarketFundsOvernightHoldingsAtCarryingValue	271840000	USD
CY2015Q4	nsp	Money Market Funds Overnight Holdings At Carrying Value MoneyMarketFundsOvernightHoldingsAtCarryingValue	247720000	USD
CY2013	nsp	Net Income Loss Available To Common Shareholders Basic NetIncomeLossAvailableToCommonShareholdersBasic	31116000	USD
CY2014	nsp	Net Income Loss Available To Common Shareholders Basic NetIncomeLossAvailableToCommonShareholdersBasic	26002000	USD
CY2015	nsp	Net Income Loss Available To Common Shareholders Basic NetIncomeLossAvailableToCommonShareholdersBasic	38409000	USD
CY2015	nsp	Number Of Days In Advance Of Beginning Of Reporting Quarter Carrier Establishes Cash Funding Rates NumberOfDaysInAdvanceOfBeginningOfReportingQuarterCarrierEstablishesCashFundingRates	P90D
CY2015Q4	nsp	Number Of Stock Based Employee Compensation Plans NumberOfStockBasedEmployeeCompensationPlans	2
CY2013	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	1862861000	USD
CY2014	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	1953983000	USD
CY2015	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	2165747000	USD
CY2014Q4	nsp	Payroll Withholdings Included In Cash Balance PayrollWithholdingsIncludedInCashBalance	152100000	USD
CY2015Q4	nsp	Payroll Withholdings Included In Cash Balance PayrollWithholdingsIncludedInCashBalance	185700000	USD
CY2015	nsp	Percentage Of Subsidiary Stock Securing Debt PercentageOfSubsidiaryStockSecuringDebt	0.65
CY2015	nsp	Percentageofgrantsissuedtodirectorsthatarevestedforannualawardgrants. Percentageofgrantsissuedtodirectorsthatarevestedforannualawardgrants.	1.00
CY2015Q4	nsp	Portionofinsurancecoststhatislessthantheagreeduponsurplusincludedinaccruedhealthinsurancecostsacntliab Portionofinsurancecoststhatislessthantheagreeduponsurplusincludedinaccruedhealthinsurancecostsacntliab	-6800000	USD
CY2015Q4	nsp	Premiums Owed To United PremiumsOwedToUnited	3100000	USD
CY2014Q4	nsp	Prepaid Health Insurance PrepaidHealthInsurance	9000000	USD
CY2015Q4	nsp	Prepaid Health Insurance PrepaidHealthInsurance	9000000	USD
CY2015Q4	nsp	Prepaid Health Insurance Current And Noncurrent PrepaidHealthInsuranceCurrentAndNoncurrent	2200000	USD
CY2015Q4	nsp	Required Deposit For Health Care Costs RequiredDepositForHealthCareCosts	3500000	USD
CY2015	nsp	Return Of Excess Claim Funds ReturnOfExcessClaimFunds	5300000	USD
CY2013	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	181444000	USD
CY2014	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	200118000	USD
CY2015	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	211060000	USD
CY2013	nsp	Section199 Tax Benefitsfor Tax Years2009to2012 Section199TaxBenefitsforTaxYears2009to2012	2000000	USD
CY2013	nsp	Section199 Tax Benefitsforthe Tax Year2013 Section199TaxBenefitsfortheTaxYear2013	500000	USD
CY2014Q4	nsp	Software Development Costs SoftwareDevelopmentCosts	41314000	USD
CY2015Q4	nsp	Software Development Costs SoftwareDevelopmentCosts	45762000	USD
CY2012	nsp	Special Dividend SpecialDividend	25700000	USD
CY2014	nsp	Special Dividend SpecialDividend	50700000	USD
CY2014Q4	nsp	Specialdividendpershare Specialdividendpershare	2.00
CY2015Q4	nsp	Specialdividendpershare Specialdividendpershare	0.00
CY2015Q4	nsp	Texas Salesand Use Tax Assessment Settlement Amount TexasSalesandUseTaxAssessmentSettlementAmount	200000	USD
CY2015	nsp	Time Period Estimate Of Incurred Claim Costs To Be Paid Included In Long Term Liabilities TimePeriodEstimateOfIncurredClaimCostsToBePaidIncludedInLongTermLiabilities	Greater than 1 year
CY2015	nsp	Time Period Estimate Of Incurred Claim Costs To Be Paid Included In Short Term Liabilities TimePeriodEstimateOfIncurredClaimCostsToBePaidIncludedInShortTermLiabilities	P1Y
CY2015	nsp	Time Period Incurred Claims Expected To Be Paid Included In Deposits TimePeriodIncurredClaimsExpectedToBePaidIncludedInDeposits	Greater than 1 year
CY2015	nsp	Time Period Incurred Claims Expected To Be Paid Recorded As Restricted Cash TimePeriodIncurredClaimsExpectedToBePaidRecordedAsRestrictedCash	P1Y
CY2014Q4	nsp	Total Cash Cash Equivalents And Marketable Securities TotalCashCashEquivalentsAndMarketableSecurities	305087000	USD
CY2015Q4	nsp	Total Cash Cash Equivalents And Marketable Securities TotalCashCashEquivalentsAndMarketableSecurities	279413000	USD
CY2013	nsp	Total Impairments Goodwill Intangiblesand Assets TotalImpairmentsGoodwillIntangiblesandAssets	6021000	USD
CY2014	nsp	Total Impairments Goodwill Intangiblesand Assets TotalImpairmentsGoodwillIntangiblesandAssets	3687000	USD
CY2015	nsp	Total Impairments Goodwill Intangiblesand Assets TotalImpairmentsGoodwillIntangiblesandAssets	10480000	USD
CY2014Q4	nsp	Total Quarterly D Ividend Regularand Special TotalQuarterlyDIvidendRegularandSpecial	2.19
CY2014Q4	nsp	Totalaccumulatedamortizationandaccumulatedimpairment Totalaccumulatedamortizationandaccumulatedimpairment	-13311000	USD
CY2015Q4	nsp	Totalaccumulatedamortizationandaccumulatedimpairment Totalaccumulatedamortizationandaccumulatedimpairment	-14180000	USD
CY2014Q4	nsp	Totalgrosscarryingamountandaggregategoodwillacquired Totalgrosscarryingamountandaggregategoodwillacquired	27768000	USD
CY2015Q4	nsp	Totalgrosscarryingamountandaggregategoodwillacquired Totalgrosscarryingamountandaggregategoodwillacquired	27768000	USD
CY2013	nsp	Treasury Stock Acquired TreasuryStockAcquired	17229000	USD
CY2014	nsp	Treasury Stock Acquired TreasuryStockAcquired	20769000	USD
CY2015	nsp	Treasury Stock Acquired TreasuryStockAcquired	67113000	USD
CY2014	nsp	Us Treasury Rates That Correspond With Weighted Average Estimated Claim Payout Period USTreasuryRatesThatCorrespondWithWeightedAverageEstimatedClaimPayoutPeriod	0.010
CY2015	nsp	Us Treasury Rates That Correspond With Weighted Average Estimated Claim Payout Period USTreasuryRatesThatCorrespondWithWeightedAverageEstimatedClaimPayoutPeriod	0.010
CY2014Q4	nsp	Unbilled Unbilled	160154000	USD
CY2015Q4	nsp	Unbilled Unbilled	190715000	USD
CY2014Q4	nsp	Unbilled Accrued Worksite Employee Payroll Costs UnbilledAccruedWorksiteEmployeePayrollCosts	192396000	USD
CY2015Q4	nsp	Unbilled Accrued Worksite Employee Payroll Costs UnbilledAccruedWorksiteEmployeePayrollCosts	161917000	USD
CY2014	nsp	Undiscounted Accrued Workers Compensation Costs UndiscountedAccruedWorkersCompensationCosts	145800000	USD
CY2015	nsp	Undiscounted Accrued Workers Compensation Costs UndiscountedAccruedWorkersCompensationCosts	172300000	USD
CY2015	nsp	Vesting Period For Officers And Other Management To Be Eligible For Restricted Stock Grants Maximum VestingPeriodForOfficersAndOtherManagementToBeEligibleForRestrictedStockGrantsMaximum	P5Y
CY2015	nsp	Vesting Period For Officers And Other Management To Be Eligible For Restricted Stock Grants Minimum VestingPeriodForOfficersAndOtherManagementToBeEligibleForRestrictedStockGrantsMinimum	P3Y
CY2015	nsp	Vestingperiodfor Initialgrantstomembersofthe Boardof Directors VestingperiodforInitialgrantstomembersoftheBoardofDirectors	P3Y
CY2015Q4	nsp	Workers Compensation Administrative Fees Accrued WorkersCompensationAdministrativeFeesAccrued	1600000	USD
CY2014	nsp	Workers Compensation Claims Paid WorkersCompensationClaimsPaid	38718000	USD
CY2015	nsp	Workers Compensation Claims Paid WorkersCompensationClaimsPaid	38368000	USD
CY2014	nsp	Workers Compensation Discount Changed During Period WorkersCompensationDiscountChangedDuringPeriod	1998000	USD
CY2015	nsp	Workers Compensation Discount Changed During Period WorkersCompensationDiscountChangedDuringPeriod	3095000	USD
CY2014	nsp	Workers Compensation Expense WorkersCompensationExpense	55971000	USD
CY2015	nsp	Workers Compensation Expense WorkersCompensationExpense	67559000	USD
CY2014Q4	nsp	Workers Compensation Liability Current Net WorkersCompensationLiabilityCurrentNet	44040000	USD
CY2015Q4	nsp	Workers Compensation Liability Current Net WorkersCompensationLiabilityCurrentNet	37438000	USD
CY2010Q4	nsp	Workers Compensation Maximum Aggregate Economic Burden For Claims In Excess Of First Layer Cap Per Policy Year WorkersCompensationMaximumAggregateEconomicBurdenForClaimsInExcessOfFirstLayerCapPerPolicyYear	5000000	USD
CY2010Q3	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1000000	USD
CY2013	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	11206000000	USD
CY2014	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	11829000000	USD
CY2015	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	13202000000	USD
CY2014Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	4674000	USD
CY2015Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	5381000	USD
CY2014Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	12010000	USD
CY2015Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	7691000	USD
CY2014Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	22444000	USD
CY2014Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	28626000	USD
CY2015Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	20250000	USD
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	196341000	USD
CY2015Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	190063000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	0	USD
CY2014Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	137769000	USD
CY2015Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	144701000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11103000	USD
CY2014	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11053000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13345000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	1259000	USD
CY2014	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	488000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	2216000	USD
CY2013	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	2632000	USD
CY2014	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	113709000	USD
CY2015	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	25693000	USD
CY2013	us-gaap	Advertising Expense AdvertisingExpense	21508000	USD
CY2014	us-gaap	Advertising Expense AdvertisingExpense	20084000	USD
CY2015	us-gaap	Advertising Expense AdvertisingExpense	15980000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11103000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11053000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13345000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1200000	USD
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1100000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	-2000000	USD
CY2014	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	-1500000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	-869000	USD
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	8000	shares
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4000	shares
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2013	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3342000	USD
CY2014	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3687000	USD
CY2015Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	9800000	USD
CY2015Q2	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1300000	USD
CY2015Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	-600000	USD
CY2015	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10480000	USD
CY2014Q4	us-gaap	Assets Assets	792595000	USD
CY2015Q4	us-gaap	Assets Assets	784912000	USD
CY2014Q4	us-gaap	Assets Current AssetsCurrent	563193000	USD
CY2015Q4	us-gaap	Assets Current AssetsCurrent	542048000	USD
CY2014Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	314596000	USD
CY2015Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	283643000	USD
CY2015Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9875000	USD
CY2014Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	28631000	USD
CY2015Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	9875000	USD
CY2015Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	9875000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	2534000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2534000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	7341000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	7341000	USD
CY2014	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	16000	USD
CY2015	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	3000	USD
CY2014	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	11000	USD
CY2015	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	3000	USD
CY2014Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	70471000	USD
CY2015Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	70273000	USD
CY2013	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	3600000	USD
CY2014	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	4100000	USD
CY2015	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	3300000	USD
CY2014Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	6000000	USD
CY2015Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	7100000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	264544000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	225755000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	276456000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	269538000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	285965000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	273768000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-38789000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	50701000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-6918000	USD
CY2014Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2014Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.17
CY2014Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.19
CY2014Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.19
CY2015Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.19
CY2015Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.22
CY2015Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.22
CY2015Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.22
CY2014Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2015Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	30758000	shares
CY2015Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	30758000	shares
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	308000	USD
CY2015Q4	us-gaap	Common Stock Value CommonStockValue	308000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	32045000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	27978000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	39387000	USD
CY2011Q4	us-gaap	Cost Method Investments CostMethodInvestments	2800000	USD
CY2014Q2	us-gaap	Costmethod Investments Other Than Temporary Impairment CostmethodInvestmentsOtherThanTemporaryImpairment	2700000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	20476000	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	18034000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	35221000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	23988000	USD
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	21356000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	40962000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3512000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3322000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5741000	USD
CY2014Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	87887000	USD
CY2015Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	17037000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2258000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1764000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-13632000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2288000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1733000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-14733000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-30000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	31000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1101000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	1575000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	1159000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	22870000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	26388000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1003000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1016000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	2241000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	16976000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	2241000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	16976000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	21867000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	25368000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1556000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1463000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	7204000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	8818000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3615000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4553000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	551000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	564000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	1058000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	1229000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	6308000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	7586000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1003000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1020000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	19626000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	8392000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	9291000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	3952000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	2252000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	2699000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	8083000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1741000	USD
CY2013	us-gaap	Depreciation And Amortization DepreciationAndAmortization	21064000	USD
CY2014	us-gaap	Depreciation And Amortization DepreciationAndAmortization	21387000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	18565000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	21064000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	21387000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	18565000	USD
CY2013	us-gaap	Dividends Common Stock DividendsCommonStock	17386000	USD
CY2014	us-gaap	Dividends Common Stock DividendsCommonStock	69493000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	21153000	USD
CY2014Q4	us-gaap	Drafts Payable DraftsPayable	29878000	USD
CY2015Q4	us-gaap	Drafts Payable DraftsPayable	23607000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.25
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.07
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.58
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.25
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.07
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.05
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.58
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4500000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4600000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5300000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1669000	USD
CY2013	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	2531000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	797000	USD
CY2014	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1621000	USD
CY2014	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	889000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	2216000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	500000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	7000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	12000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	36000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	300000	USD
CY2014Q4	us-gaap	Flight Equipment Owned Gross FlightEquipmentOwnedGross	35879000	USD
CY2015Q4	us-gaap	Flight Equipment Owned Gross FlightEquipmentOwnedGross	0	USD
CY2014Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	38604000	USD
CY2015Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	39919000	USD
CY2013	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	83986000	USD
CY2014	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	84717000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	84259000	USD
CY2013	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	3300000	USD
CY2014Q1	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	2500000	USD
CY2013	us-gaap	Gross Profit GrossProfit	393251000	USD
CY2014Q1	us-gaap	Gross Profit GrossProfit	106176000	USD
CY2014Q2	us-gaap	Gross Profit GrossProfit	95453000	USD
CY2014Q3	us-gaap	Gross Profit GrossProfit	100817000	USD
CY2014Q4	us-gaap	Gross Profit GrossProfit	101359000	USD
CY2014	us-gaap	Gross Profit GrossProfit	403805000	USD
CY2015Q1	us-gaap	Gross Profit GrossProfit	129860000	USD
CY2015Q2	us-gaap	Gross Profit GrossProfit	104219000	USD
CY2015Q3	us-gaap	Gross Profit GrossProfit	106743000	USD
CY2015Q4	us-gaap	Gross Profit GrossProfit	97045000	USD
CY2015	us-gaap	Gross Profit GrossProfit	437867000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	53732000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	47627000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65619000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21700000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19623000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26229000	USD
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	938000	USD
CY2014	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2014	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	592000	USD
CY2015	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	627000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	18806000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	16670000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22967000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1993000	USD
CY2014	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1939000	USD
CY2014	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	10737000	USD
CY2015	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	29052000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	18091000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	32013000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	22069000	USD
CY2013	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-4982000	USD
CY2014	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	10663000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-13884000	USD
CY2013	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	7815000	USD
CY2014	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	15805000	USD
CY2015	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	26159000	USD
CY2014Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	14457000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-55000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-143000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	54000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2286000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2204000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2696000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	534000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	455000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	530000	USD
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	27191000	USD
CY2014	us-gaap	Income Taxes Paid IncomeTaxesPaid	16429000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	39806000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-982000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	1996000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	707000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	19623000	USD
CY2014	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-34893000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	25549000	USD
CY2013	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	23731000	USD
CY2014	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	18595000	USD
CY2015	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-30479000	USD
CY2013	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	-8839000	USD
CY2014	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	13226000	USD
CY2015	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	-4686000	USD
CY2013	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-4825000	USD
CY2014	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	4039000	USD
CY2015	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-1060000	USD
CY2013	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	2402000	USD
CY2014	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	5596000	USD
CY2015	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-514000	USD
CY2013	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	-12930000	USD
CY2015Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	13588000	USD
CY2013	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	158000	USD
CY2014	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	106000	USD
CY2014Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	16591000	USD
CY2013	us-gaap	Operating Expenses OperatingExpenses	337028000	USD
CY2014	us-gaap	Operating Expenses OperatingExpenses	356331000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	372168000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	56223000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3206000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	12372000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	34664000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	141713000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	65083000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	32032000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	9564000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	1891000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	8385000	USD
CY2014Q4	us-gaap	Net Income Loss NetIncomeLoss	8164000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	28004000	USD
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	13787000	USD
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	7314000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	11950000	USD
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	6339000	USD
CY2015	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	33000	USD
CY2013	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-2119000	USD
CY2014	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-1891000	USD
CY2015	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-836000	USD
CY2014Q4	us-gaap	Land Land	5214000	USD
CY2015Q4	us-gaap	Land Land	5214000	USD
CY2015Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	600000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	792595000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	784912000	USD
CY2014Q4	us-gaap	Liabilities Current LiabilitiesCurrent	496451000	USD
CY2015Q4	us-gaap	Liabilities Current LiabilitiesCurrent	487711000	USD
CY2014Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	92048000	USD
CY2015Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	124746000	USD
CY2013Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	0	USD
CY2014Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	0	USD
CY2015Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	0	USD
CY2015Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	125000000	USD
CY2015Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	150000000	USD
CY2015	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0025
CY2014Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	28631000	USD
CY2015Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	9875000	USD
CY2014Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	14125000	USD
CY2015Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	26048000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-30419000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-87806000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-84373000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-43034000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	39390000	USD
CY2015	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2015Q1	us-gaap	Sales Revenue Net SalesRevenueNet	699479000	USD
CY2015Q2	us-gaap	Sales Revenue Net SalesRevenueNet	627838000	USD
CY2015Q3	us-gaap	Sales Revenue Net SalesRevenueNet	626286000	USD
CY2015Q4	us-gaap	Sales Revenue Net SalesRevenueNet	650011000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	21153000	USD
CY2014Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	3414000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	14460000	USD
CY2014Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	13009000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	47474000	USD
CY2015Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	23520000	USD
CY2015Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	12217000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	19936000	USD
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	10026000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	65699000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	48458000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	13961000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	4200000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	6366000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	9423000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	11196000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	3312000	USD
CY2013	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	13900000	USD
CY2014	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	13400000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	13600000	USD
CY2014Q4	us-gaap	Other Assets OtherAssets	145057000	USD
CY2015Q4	us-gaap	Other Assets OtherAssets	181105000	USD
CY2014Q4	us-gaap	Other Assets Current OtherAssetsCurrent	17649000	USD
CY2015Q4	us-gaap	Other Assets Current OtherAssetsCurrent	17135000	USD
CY2014Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1725000	USD
CY2015Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1379000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	13000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-26000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-3000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2649000	USD
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	47000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-113000	USD
CY2014Q4	us-gaap	Other Receivables OtherReceivables	2952000	USD
CY2015Q4	us-gaap	Other Receivables OtherReceivables	2259000	USD
CY2013	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	916000	USD
CY2014	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	2002000	USD
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	981000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	17386000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	69493000	USD
CY2013	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	54756000	USD
CY2014	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	69578000	USD
CY2015	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	10558000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11562000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	19124000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	17844000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	29.56
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1500000	USD
CY2014Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	44040000	USD
CY2015Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	37418000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	214481000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	232771000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300000	USD
CY2014Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2015Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2014Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2015Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2014Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2015Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2014Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2015Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2014Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2015Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2014Q4	us-gaap	Prepaid Insurance PrepaidInsurance	21301000	USD
CY2015Q4	us-gaap	Prepaid Insurance PrepaidInsurance	7417000	USD
CY2014	us-gaap	Prior Period Reclassification Adjustment PriorPeriodReclassificationAdjustment	6300000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1127000	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1288000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1303000	USD
CY2013	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	15201000	USD
CY2014	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	28494000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	10593000	USD
CY2013	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	0	USD
CY2014	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	0	USD
CY2015	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	12159000	USD
CY2013	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	57000	USD
CY2014	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	122000	USD
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	153000	USD
CY2013	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1448000	USD
CY2014	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	279000	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	374000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	280686000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	251822000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	84345000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	61759000	USD
CY2013	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	14581000	USD
CY2014	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	15285000	USD
CY2015	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	18479000	USD
CY2013	us-gaap	Sales Revenue Net SalesRevenueNet	2256112000	USD
CY2014Q1	us-gaap	Sales Revenue Net SalesRevenueNet	636999000	USD
CY2014Q2	us-gaap	Sales Revenue Net SalesRevenueNet	564621000	USD
CY2014Q3	us-gaap	Sales Revenue Net SalesRevenueNet	560303000	USD
CY2014Q4	us-gaap	Sales Revenue Net SalesRevenueNet	595865000	USD
CY2014	us-gaap	Sales Revenue Net SalesRevenueNet	2357788000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
CY2014Q4	us-gaap	Treasury Stock Value TreasuryStockValue	148465000	USD
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	2603614000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	11103000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	11053000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	13345000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	997059	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	28000	shares
CY2014Q4	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	1200000	USD
CY2014Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	4031000	USD
CY2015Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	2971000	USD
CY2014Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	5425000	shares
CY2015Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6493000	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	527000	USD
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	43000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	28000	shares
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	28.04
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	29.56
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	25.14
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2015Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	527000	USD
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y5M
CY2015	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2	P4Y5M
CY2014	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	112458	shares
CY2015	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	114523	shares
CY2013	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	34000	shares
CY2014	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	37000	shares
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	24000	shares
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	15000	shares
CY2013	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1448000	USD
CY2014	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	279000	USD
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	374000	USD
CY2015Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	524332	shares
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	240905000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	253272000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	204096000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	172455000	USD
CY2013	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1127000	USD
CY2014	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1288000	USD
CY2015	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1303000	USD
CY2014	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	580804	shares
CY2015	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	1244433	shares
CY2015Q4	us-gaap	Treasury Stock Value TreasuryStockValue	205325000	USD
CY2013	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	17229000	USD
CY2014	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	20769000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	67113000	USD
CY2014Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	55645000	USD
CY2015Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	45835000	USD
CY2015Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	1493000	USD
CY2015Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	20554000	USD
CY2015Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	1774000	USD
CY2015Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	6245000	USD
CY2015Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	4695000	USD
CY2015Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	35961000	USD
CY2015Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	1200000	USD
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24850000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24708000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24308000	shares
CY2014Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	45592000	USD
CY2015Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	39053000	USD
CY2013Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	120833000	USD
CY2014Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	136088000	USD
CY2015Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	162184000	USD
CY2014Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	92048000	USD
CY2015Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	124746000	USD
CY2015	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">New Accounting Pronouncements</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We believe that we have implemented the accounting pronouncements with a material impact on our financial statements.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In May 2014, the Financial Accounting Standards Board issued Accounting Standards (“FASB”) Update (“ASU”) No. 2014-09, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Revenue from Contracts with Customers (Topic 606)</font><font style="font-family:inherit;font-size:10pt;">. ASU No. 2014-09 outlines a single comprehensive revenue recognition model for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. Under ASU No. 2014-09, an entity recognizes revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 is effective for annual reporting periods ending after December 15, 2017, and early adoption is not permitted. Companies may use either a full retrospective or a modified retrospective approach to adopt ASU No. 2014-09. We are currently evaluating the guidance and have not determined the impact this standard may have on our Consolidated Financial Statements.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In November 2015, the FASB issued ASU No. 2015-17, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes</font><font style="font-family:inherit;font-size:10pt;">, which requires companies to present deferred income tax assets and deferred income tax liabilities, along with any valuation allowance, as noncurrent in a classified balance sheet instead of the current requirement to separate deferred income tax liabilities and assets into current and noncurrent amounts. ASU 2015-17 is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early application is permitted either prospectively or retrospectively. In December 2015, we adopted ASU No. 2015-17 retrospectively, resulting in a reclassification of a </font><font style="font-family:inherit;font-size:10pt;">$6.3 million</font><font style="font-family:inherit;font-size:10pt;"> deferred tax asset from current to long term in 2014.</font></div></div>
CY2015	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Reclassifications</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior year amounts have been reclassified to conform to the </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2015</font><font style="font-family:inherit;font-size:10pt;"> presentation.</font></div></div>
CY2015	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with United States Generally Accepted Accounting Principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.</font></div></div>

Files In Submission

Name	View Source	Status
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0001000753-16-000075-index.html	Edgar Link	pending
0001000753-16-000075.txt	Edgar Link	pending
0001000753-16-000075-xbrl.zip	Edgar Link	pending
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nsp-20151231.xml	Edgar Link	completed
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$NSP
INSPERITY, INC. Stock $nsp

2015 Form 10-K Financial Statement

#000100075316000075 Filed on February 12, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NSP INSPERITY, INC. Stock $nsp

2015 Form 10-K Financial Statement

#000100075316000075 Filed on February 12, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NSP
INSPERITY, INC. Stock $nsp