$APEI
AMERICAN PUBLIC EDUCATION INC Stock $apei

$apei Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000120179218000003 Filed on February 27, 2018

Income Statement

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$78.09M	$73.28M	$72.20M
YoY Change	-0.69%	-0.71%	-5.93%
Cost Of Revenue	$28.65M	$28.72M	$29.83M
YoY Change	-4.66%	1.27%	2.19%
Gross Profit	$49.44M	$44.56M	$42.36M
YoY Change	1.77%	-1.96%	-10.93%
Gross Profit Margin	63.32%	60.81%	58.67%
Selling, General & Admin	$31.65M	$31.88M	$30.64M
YoY Change	-2.53%	5.33%	-3.93%
% of Gross Profit	64.02%	71.54%	72.33%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$4.620M	$4.690M	$4.730M
YoY Change	-2.94%	-4.48%	-1.87%
% of Gross Profit	9.34%	10.53%	11.17%
Operating Expenses	$36.26M	$31.88M	$30.64M
YoY Change	-2.58%	5.33%	-3.93%
Operating Profit	$13.18M	$7.599M	$6.318M
YoY Change	16.02%	1838.52%	-40.73%
Interest Expense	$140.0K	$17.00K	$15.00K
YoY Change	1300.0%	-54.05%	-59.46%
% of Operating Profit	1.06%	0.22%	0.24%
Other Income/Expense, Net
YoY Change
Pretax Income	$12.78M	$7.616M	$6.333M
YoY Change	13.48%	1675.29%	-40.8%
Income Tax	$5.530M	$3.294M	$2.525M
% Of Pretax Income	43.28%	43.25%	39.87%
Net Earnings	$8.417M	$4.366M	$3.829M
YoY Change	22.11%	1239.26%	-41.95%
Net Earnings / Revenue	10.78%	5.96%	5.3%
Basic Earnings Per Share	$0.52	$0.27	$0.24
Diluted Earnings Per Share	$0.51	$0.27	$0.23
COMMON SHARES
Basic Shares Outstanding	16.27M shares	16.25M shares	16.24M shares
Diluted Shares Outstanding		16.38M shares	16.36M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$179.2M	$166.3M	$157.1M
YoY Change	22.4%	20.77%	26.59%
Cash & Equivalents	$179.2M	$166.3M	$157.1M
Short-Term Investments
Other Short-Term Assets	$4.800M	$6.700M	$7.200M
YoY Change	-9.43%	-35.58%	-25.77%
Inventory
Prepaid Expenses	$4.792M	$6.651M	$7.241M
Receivables	$7.136M	$6.389M	$6.201M
Other Receivables	$0.00	$700.0K	$3.100M
Total Short-Term Assets	$191.1M	$180.1M	$173.7M
YoY Change	20.49%	16.06%	21.36%
LONG-TERM ASSETS
Property, Plant & Equipment	$95.25M	$92.17M	$93.69M
YoY Change	-2.5%	-7.05%	-12.84%
Goodwill	$33.90M	$33.90M	$33.90M
YoY Change	0.0%	0.0%	-12.26%
Intangibles	$4.606M
YoY Change	-11.49%
Long-Term Investments	$12.48M	$14.72M	$14.67M
YoY Change	-14.58%	1.06%	-16.33%
Other Assets	$6.276M	$9.061M	$8.949M
YoY Change	-27.83%	6.95%	3.64%
Total Long-Term Assets	$147.9M	$149.8M	$151.2M
YoY Change	-5.79%	-5.27%	-12.24%
TOTAL ASSETS
Total Short-Term Assets	$191.1M	$180.1M	$173.7M
Total Long-Term Assets	$147.9M	$149.8M	$151.2M
Total Assets	$339.0M	$329.9M	$324.9M
YoY Change	7.42%	5.29%	3.01%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$8.844M	$5.041M	$6.411M
YoY Change	29.05%	-73.61%	-71.25%
Accrued Expenses	$3.621M	$13.61M	$12.49M
YoY Change	-74.36%
Deferred Revenue	$19.37M
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$43.35M	$40.65M	$39.71M
YoY Change	2.79%	-7.58%	-10.32%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$0.00	$0.00	$0.00
YoY Change
TOTAL LIABILITIES
Total Short-Term Liabilities	$43.35M	$40.65M	$39.71M
Total Long-Term Liabilities	$0.00	$0.00	$0.00
Total Liabilities	$49.63M	$49.88M	$50.55M
YoY Change	-2.59%	-11.78%	-16.23%
SHAREHOLDERS EQUITY
Retained Earnings	$108.6M	$100.2M	$95.79M
YoY Change	24.15%	24.33%	19.39%
Common Stock	$180.8M	$179.9M	$178.6M
YoY Change	2.04%	2.07%	2.13%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$289.4M	$280.0M	$274.3M
YoY Change
Total Liabilities & Shareholders Equity	$339.0M	$329.9M	$324.9M
YoY Change	7.42%	5.29%	3.01%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	$8.417M	$4.366M	$3.829M
YoY Change	22.11%	1239.26%	-41.95%
Depreciation, Depletion And Amortization	$4.620M	$4.690M	$4.730M
YoY Change	-2.94%	-4.48%	-1.87%
Cash From Operating Activities	$18.68M	$12.99M	$11.22M
YoY Change	40.24%	-6.55%	28.38%
INVESTING ACTIVITIES
Capital Expenditures	-$5.250M	$2.754M	$2.111M
YoY Change	-0.38%	-0.43%	-43.93%
Acquisitions
YoY Change
Other Investing Activities	-$300.0K	$0.00	$1.490M
YoY Change	-135.71%	-100.0%
Cash From Investing Activities	-$5.550M	-$3.860M	-$1.890M
YoY Change	25.57%	777.27%	-58.19%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-190.0K	0.000	0.000
YoY Change	-24.0%	-100.0%	-100.0%
NET CHANGE
Cash From Operating Activities	18.68M	12.99M	11.22M
Cash From Investing Activities	-5.550M	-3.860M	-1.890M
Cash From Financing Activities	-190.0K	0.000	0.000
Net Change In Cash	12.94M	9.130M	9.330M
YoY Change	49.6%	-32.87%	127.01%
FREE CASH FLOW
Cash From Operating Activities	$18.68M	$12.99M	$11.22M
Capital Expenditures	-$5.250M	$2.754M	$2.111M
Free Cash Flow	$23.93M	$10.24M	$9.109M
YoY Change	28.73%	-8.07%	83.1%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013Q1	apei	Additional Authorized Amount For Share Repurchase Program AdditionalAuthorizedAmountForShareRepurchaseProgram	15000000	USD
CY2014Q2	apei	Additional Authorized Amount For Share Repurchase Program AdditionalAuthorizedAmountForShareRepurchaseProgram	15000000	USD
CY2015Q2	apei	Additional Authorized Amount For Share Repurchase Program AdditionalAuthorizedAmountForShareRepurchaseProgram	15000000	USD
CY2015Q2	apei	Additional Authorized Amount For Share Repurchase Program Cumulative Amount AdditionalAuthorizedAmountForShareRepurchaseProgramCumulativeAmount	45000000	USD
CY2017	apei	Compliance Regulation Minimum Response Percentage Of Students Required ComplianceRegulationMinimumResponsePercentageOfStudentsRequired	0.05
CY2016Q4	apei	Deferred Tax Assets Tax Deferred Expense Compensationand Benefits Restricted Stock DeferredTaxAssetsTaxDeferredExpenseCompensationandBenefitsRestrictedStock	1874000	USD
CY2017Q4	apei	Deferred Tax Assets Tax Deferred Expense Compensationand Benefits Restricted Stock DeferredTaxAssetsTaxDeferredExpenseCompensationandBenefitsRestrictedStock	922000	USD
CY2017	apei	Defined Contribution Plan Employee Immediately Vesting Percentage DefinedContributionPlanEmployeeImmediatelyVestingPercentage	1.00
CY2017Q4	apei	Finite Lived Intangible Assets Amortization Expense Year Threeand Thereafter FiniteLivedIntangibleAssetsAmortizationExpenseYearThreeandThereafter	0	USD
CY2016Q4	apei	Indefinite Lived Intangible Assets Excluding Goodwill Net IndefiniteLivedIntangibleAssetsExcludingGoodwillNet	3721000	USD
CY2017Q4	apei	Indefinite Lived Intangible Assets Excluding Goodwill Net IndefiniteLivedIntangibleAssetsExcludingGoodwillNet	3721000	USD
CY2015	apei	Instructional Costs And Expenses InstructionalCostsAndExpenses	118848000	USD
CY2016	apei	Instructional Costs And Expenses InstructionalCostsAndExpenses	117013000	USD
CY2017	apei	Instructional Costs And Expenses InstructionalCostsAndExpenses	116161000	USD
CY2017	apei	Number Of Campuses NumberOfCampuses	5	Campus
CY2017	apei	Number Of Students NumberOfStudents	86000	Person
CY2017	apei	Number Of Subsidiaries NumberOfSubsidiaries	2	subsidiary
CY2015	apei	Paymentsto Acquire Property Plantand Equipmentand Proceedsfrom Saleof Buildings PaymentstoAcquirePropertyPlantandEquipmentandProceedsfromSaleofBuildings	26002000	USD
CY2016	apei	Paymentsto Acquire Property Plantand Equipmentand Proceedsfrom Saleof Buildings PaymentstoAcquirePropertyPlantandEquipmentandProceedsfromSaleofBuildings	13826000	USD
CY2017	apei	Paymentsto Acquire Property Plantand Equipmentand Proceedsfrom Saleof Buildings PaymentstoAcquirePropertyPlantandEquipmentandProceedsfromSaleofBuildings	10855000	USD
CY2015Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2015Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	199391	shares
CY2015Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2015Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2015Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	100000	shares
CY2015Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	203820	shares
CY2015Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	160000	shares
CY2015Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	200000	shares
CY2015Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2015Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2015Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	129849	shares
CY2015Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	118746	shares
CY2015Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	211040	shares
CY2016Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2016Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q1	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q2	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017Q3	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
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CY2017Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
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CY2017Q4	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2015	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	1322846	shares
CY2016	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017	apei	Stock Repurchased During Period Shares Publicly Announced Plans StockRepurchasedDuringPeriodSharesPubliclyAnnouncedPlans	0	shares
CY2017	apei	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Asset Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense	-3700000	USD
CY2017	apei	Tuition Refund Percentage Before Or During Week One TuitionRefundPercentageBeforeOrDuringWeekOne	1
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001201792
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	16391309	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	260900000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	AMERICAN PUBLIC EDUCATION INC
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2017	dei	Trading Symbol TradingSymbol	APEI
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	6853000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	8844000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	6949000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	7136000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	14124000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	13423000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	86749000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	99177000	USD
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CY2015	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	-519000	USD
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CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6229000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5164000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5032000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5912000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5211000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6246000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	8077000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	6276000	USD
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CY2013Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	38100000	USD
CY2017	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	46764000	USD
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CY2017Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Assets Other Than Goodwill BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill	8082000	USD
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CY2017Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	0	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-9900000	USD
CY2017Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	48000	USD
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CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16268000	shares
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CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	16268000	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	161000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	163000	USD
CY2016Q4	us-gaap	Cost Method Investments CostMethodInvestments	3800000	USD
CY2017Q4	us-gaap	Cost Method Investments CostMethodInvestments	3800000	USD
CY2017	us-gaap	Costmethod Investments Other Than Temporary Impairment CostmethodInvestmentsOtherThanTemporaryImpairment	300000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	275629000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	274863000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	264389000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	17910000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	13518000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	11989000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	20232000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	15395000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13987000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2322000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1877000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1998000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-241000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-424000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2810000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-160000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-455000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2494000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	15751000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	9933000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	8775000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6281000	USD
CY2016Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	20639000	USD
CY2017Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	19374000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	81000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-31000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	316000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	168000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	6976000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3652000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Severance Payments DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments	798000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Severance Payments DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments	679000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1057000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	415000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	3079000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	1569000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Rent DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Rent DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent	67000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	8775000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6281000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	10886000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	6066000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	941000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	1284000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	77000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	1716000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	1017000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2208000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1489000	USD
CY2015	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3309000	USD
CY2016	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3284000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3824000	USD
CY2017	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.6
CY2015	us-gaap	Depreciation Depreciation	19626000	USD
CY2016	us-gaap	Depreciation Depreciation	18674000	USD
CY2017	us-gaap	Depreciation Depreciation	18178000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	20520000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	19384000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	18776000	USD
CY2016Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	2100000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	0	USD
CY2015	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-817000	USD
CY2016	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-6000000	USD
CY2016	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-5970000	USD
CY2017	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-2100000	USD
CY2017	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-2093000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.94
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.02
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.50
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.28
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.49
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.29
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3824
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3821
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3524
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.0000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.0000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.1147
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.0053
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.0056
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.0631
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.0032
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.0062
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0042
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0303
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0327
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0498
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2467000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2064000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2473000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	54000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	94000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	60000	USD
CY2016Q4	us-gaap	Equity Method Investments EquityMethodInvestments	14611000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	12481000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-519000	USD
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-1120000	USD
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2878000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	3476000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	563000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	322000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4361000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4361000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1483000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	885000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-817000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-5970000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-2093000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	73047000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	68666000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	69024000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	38634000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	33899000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	33899000	USD
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	38634000	USD
CY2016Q4	us-gaap	Goodwill Gross GoodwillGross	38634000	USD
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	33899000	USD
CY2016Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	4735000	USD
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2016Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	4700000	USD
CY2015	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	4735000	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	52396000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16007000	USD
CY2016Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	10697000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	429000	USD
CY2016Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	11259000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	38392000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	8318000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6333000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7616000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12777000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	35044000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	90000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	703000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2430000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20072000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14940000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11493000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-3741000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	18370000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	13683000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	11415000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	278000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1590000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	221000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	2060000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-166000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-242000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	133000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1278000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1626000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	18037000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	16637000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	12836000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-4765000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	589000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1991000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1787000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-968000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	187000	USD
CY2015	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	682000	USD
CY2016	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-123000	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	1151000	USD
CY2015	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	56000	USD
CY2016	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-424000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-2195000	USD
CY2015	us-gaap	Increase Decrease In Deferred Revenue And Customer Advances And Deposits IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits	1453000	USD
CY2016	us-gaap	Increase Decrease In Deferred Revenue And Customer Advances And Deposits IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits	-4619000	USD
CY2017	us-gaap	Increase Decrease In Deferred Revenue And Customer Advances And Deposits IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits	-1265000	USD
CY2015	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-2029000	USD
CY2016	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	0	USD
CY2017	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	0	USD
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-64000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-997000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	82000	USD
CY2016Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	3721000	USD
CY2017Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	3721000	USD
CY2016Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	8082000	USD
CY2017Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	8082000	USD
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	5204000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4606000	USD
CY2015	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	115000	USD
CY2016	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	116000	USD
CY2017	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	185000	USD
CY2015	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	115000	USD
CY2016	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	116000	USD
CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	185000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	50950000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	49632000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	315620000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	339038000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	42175000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	43351000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-35774000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1849000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1489000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-31138000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-13548000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-13595000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	57012000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	56014000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	47938000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	32414000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	10340000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	6596000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	326000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	6893000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	24155000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	4509000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	3829000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	4366000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	8417000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	21121000	USD
CY2017	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	52281000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	38276000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	34859000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	16162000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2380000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	2366000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	2424000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2406000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	2350000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	4236000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	8696000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	9151000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	133000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-329000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-353000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1265000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2573000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3933000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	35310000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	847000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1587000	USD
CY2017	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	46128000	USD
CY2015	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	3871000	USD
CY2016	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	950000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	300000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	26002000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13826000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10855000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	5327000	USD
CY2017Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	4792000	USD
CY2015	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
CY2016	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	2957000	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	55000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	118000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	98000	USD
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2016	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	844000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1493000	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	182000	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	118000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	98000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	184436000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	191551000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	97687000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	92374000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	1600000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	2300000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	87448000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	108569000	USD
CY2015	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	327910000	USD
CY2016Q1	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	83966000	USD
CY2016Q2	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	76745000	USD
CY2016Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	73803000	USD
CY2016Q4	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	78625000	USD
CY2016	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	313139000	USD
CY2017Q1	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	75688000	USD
CY2017Q2	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	72196000	USD
CY2017Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	73279000	USD
CY2017Q4	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	78085000	USD
CY2017	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	299248000	USD
CY2015	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	62397000	USD
CY2016	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	59095000	USD
CY2017	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	58335000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	5912000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	5211000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	6246000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	329872	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	259969	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	109616	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	33.65
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	34.68
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	37.52
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1057000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	290000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	194000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	49147	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	53024	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	136351	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	359000	USD
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	246000	USD
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	434401	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	329872	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	259969	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	109616	shares
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	30.04
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	33.65
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	34.68
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	37.52
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	3.29
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	7.00
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	6.99
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	35.97
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	37.09
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	35.24
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2017	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	359000	USD
CY2016Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	246000	USD
CY2017Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0	USD
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P1Y3M20D
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P0Y6M10D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P0M5D
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y3M20D
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P0Y6M10D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P0M5D
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	55382	shares
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	16878	shares
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	14002	shares
CY2015	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	66000	USD
CY2016	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	47000	USD
CY2017	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	72000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	55000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	119000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	98000	USD
CY2012Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	20000000	USD
CY2015Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	65000000	USD
CY2015Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	13442543	USD
CY2015Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	15114029	USD
CY2015Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	12107835	USD
CY2015Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2015Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	15027043	USD
CY2015Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	15027043	USD
CY2015Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	15027043	USD
CY2015Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	4102131	USD
CY2015Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	9220841	USD
CY2015Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	15114029	USD
CY2015Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	15114029	USD
CY2015Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	2806575	USD
CY2015Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	7214395	USD
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2016Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2017Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	148008	USD
CY2015Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	213523	shares
CY2015Q2	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164093	shares
CY2015Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164093	shares
CY2015Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164562	shares
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	480645000	shares
CY2016Q2	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	495378000	shares
CY2016Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	500687000	shares
CY2016Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	500996000	shares
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	744718000	shares
CY2017Q2	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	779133000	shares
CY2017Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	779930000	shares
CY2017Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	780725000	shares
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CY2015Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	155695	shares
CY2015Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	263523	shares
CY2015Q2	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	147289	shares
CY2015Q2	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	147289	shares
CY2015Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164093	shares
CY2015Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164093	shares
CY2015Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164562	shares
CY2015Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164562	shares
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	480645000	shares
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	164562000	shares
CY2016Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	480645000	shares
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CY2016Q2	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	481497000	shares
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CY2016Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	500687000	shares
CY2016Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	500996000	shares
CY2016Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	500996000	shares
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	744718000	shares
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	500996000	shares
CY2017Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	744718000	shares
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CY2017Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	780725000	shares
CY2017Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	780725000	shares
CY2015Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2015Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2015Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2015Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	100000	shares
CY2015Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	203820	shares
CY2015Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	160000	shares
CY2015Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	200000	shares
CY2015Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2015Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2015Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	129849	shares
CY2015Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	118746	shares
CY2015Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	199391	shares
CY2015Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	211040	shares
CY2016Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
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CY2016Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2016Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
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CY2017Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2015	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	1322846	shares
CY2016	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2017	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2015	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	35310000	USD
CY2016	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	848000	USD
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1587000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	234218000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	237153000	USD
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16214000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16380000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16676000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16068000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16236000	shares
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	264670000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	289406000	USD
CY2016Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	559000	USD
CY2017Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	1710000	USD
CY2015Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2015Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2015Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2015Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	31.69
CY2015Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	30.84
CY2015Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	24.93
CY2015Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	25.59
CY2015Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2015Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2015Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	23.15
CY2015Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	22.39
CY2015Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	22.11
CY2015Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	23.19
CY2016Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2016Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2015	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	25.34
CY2016	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2017	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0.00
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16798000	shares
CY2017	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Concentration of credit risk.</font><font style="font-family:inherit;font-size:10pt;"> The Company maintains its cash and cash equivalents in bank deposit accounts with various financial institutions. Cash and cash equivalent balances may exceed the FDIC insurance limit. The Company has historically not experienced any losses in such accounts. </font></div></div>
CY2017	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Nature of Business</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">American Public Education, Inc., or APEI, which together with its subsidiaries is referred to as the “Company,” is a provider of online and campus-based postsecondary education to approximately </font><font style="font-family:inherit;font-size:10pt;">85,500</font><font style="font-family:inherit;font-size:10pt;"> students through </font><font style="font-family:inherit;font-size:10pt;">two</font><font style="font-family:inherit;font-size:10pt;"> subsidiary institutions:</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><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">American Public University System, Inc., or APUS, provides online postsecondary education directed primarily at the needs of the military, military-affiliated and public safety communities through American Military University, or AMU, and American Public University, or APU. APUS is regionally accredited by the Higher Learning Commission.</font></div></td></tr></table><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">National Education Seminars, Inc., which is referred to herein as Hondros College of Nursing, or HCN, provides nursing education to students at </font><font style="font-family:inherit;font-size:10pt;">five</font><font style="font-family:inherit;font-size:10pt;"> campuses in Ohio as well as online to serve the needs of the nursing and healthcare communities. HCN is nationally accredited by the Accrediting Council of Independent Colleges and Schools, or ACICS, and the online Registered Nurse to Bachelor of Science in Nursing program, or RN-to-BSN Program, is accredited by the Commission on Collegiate Nursing Education. In June 2016, HCN was notified that its Diploma in Practical Nursing and Associate Degree in Nursing programs, or the PN and ADN Programs, were granted pre-accreditation candidacy status by the National League for Nursing Commission for Nursing Education Accreditation. </font></div></td></tr></table><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:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company’s institutions are licensed or otherwise authorized, or are in the process of obtaining such licenses or authorizations, to offer postsecondary education programs by state authorities to the extent the institutions believe such licenses or authorizations are required, and are certified by the United States Department of Education, or ED, to participate in student financial aid programs authorized under Title IV of the Higher Education Act of 1965, as amended, or Title IV programs.</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;">The Company’s operations are organized into </font><font style="font-family:inherit;font-size:10pt;">two</font><font style="font-family:inherit;font-size:10pt;"> reportable segments:</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><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">American Public Education Segment, or APEI Segment.</font><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"> </font><font style="font-family:inherit;font-size:10pt;">This segment reflects the operational activities at APUS, other corporate activities, and minority investments.</font></div></td></tr></table><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Hondros College of Nursing Segment, or HCN Segment. </font><font style="font-family:inherit;font-size:10pt;">This segment reflects the operational activities of HCN.</font></div></td></tr></table></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Use of estimates.</font><font style="font-family:inherit;font-size:10pt;"> In preparing financial statements in conformity with GAAP, the Company is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. The Company evaluates these estimates and judgments on an ongoing basis and bases its estimates on experience, current and expected future conditions and various other assumptions that the Company believes are reasonable under the circumstances. Actual results could differ from those estimates.</font></div></div>

Files In Submission

Name	View Source	Status
0001201792-18-000003-index-headers.html	Edgar Link	pending
0001201792-18-000003-index.html	Edgar Link	pending
0001201792-18-000003.txt	Edgar Link	pending
0001201792-18-000003-xbrl.zip	Edgar Link	pending
apei-20171231.xml	Edgar Link	completed
apei-20171231.xsd	Edgar Link	pending
apei-20171231x10k.htm	Edgar Link	pending
apei-20171231_cal.xml	Edgar Link	unprocessable
apei-20171231_def.xml	Edgar Link	unprocessable
apei-20171231_lab.xml	Edgar Link	unprocessable
apei-20171231_pre.xml	Edgar Link	unprocessable
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apei2017123110kexh211.htm	Edgar Link	pending
apei2017123110kexh231.htm	Edgar Link	pending
apei2017123110kexh311.htm	Edgar Link	pending
apei2017123110kexh312.htm	Edgar Link	pending
apei2017123110kexh321.htm	Edgar Link	pending
apei2017123110kexh322.htm	Edgar Link	pending
apeilogoa06.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
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$APEI
AMERICAN PUBLIC EDUCATION INC Stock $apei

2017 Q4 Form 10-K Financial Statement

#000120179218000003 Filed on February 27, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$APEI AMERICAN PUBLIC EDUCATION INC Stock $apei

2017 Q4 Form 10-K Financial Statement

#000120179218000003 Filed on February 27, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$APEI
AMERICAN PUBLIC EDUCATION INC Stock $apei