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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Common Class A [Member] Common Stock [Member] USD ($)	Common Class A [Member]	Common Class B [Member] Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Retained Earnings [Member] USD ($)	Total USD ($)
Balance at December 31, 2011 at Jul. 31, 2011
Repurchase of Class A common stock (shares) (in Shares)		(1,499,776)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Balance at Dec. 31, 2014			$ 319us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance (in Shares) at Dec. 31, 2014			2,562,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance at December 31, 2011 at Dec. 31, 2011	279,366us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		468us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	10,918us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(4,508)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	80,877us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	367,121us-gaap_StockholdersEquity
Balance at December 31, 2011 (in Shares) at Dec. 31, 2011	22,195,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		3,762,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net income						80,362us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	80,362us-gaap_NetIncomeLoss
Gain on cash flow hedges, net of tax expense					1,893us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember		1,893us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Issuance of stock in connection with employee stock plans	8,652us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						8,652us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Issuance of stock in connection with employee stock plans (shares) (in Shares)	647,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of restricted stock to employees (shares) (in Shares)	3,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Repurchase of Class A common stock	(23,279)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						(23,279)us-gaap_StockRepurchasedDuringPeriodValue
Repurchase of Class A common stock (shares) (in Shares)	(929,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Class B common stock converted to Class A common stock	125us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(125)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Class B common stock converted to Class A common stock (shares) (in Shares)	1,000,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(1,000,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Compensation for stock and stock option issuances and excess tax benefits from option exercises	3,937us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember			1,481us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			5,418us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Dividends paid						(12,066)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(12,066)us-gaap_Dividends
Balance at Dec. 31, 2012	268,801us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		343us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	12,399us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(2,615)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	149,173us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	428,101us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2012	22,916,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		2,762,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net income						106,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	106,000us-gaap_NetIncomeLoss
Gain on cash flow hedges, net of tax expense					1,077us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember		1,077us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Issuance of stock in connection with employee stock plans	5,149us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						5,149us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Issuance of stock in connection with employee stock plans (shares) (in Shares)	283,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of restricted stock to employees (shares) (in Shares)	117,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Repurchase of Class A common stock	(7,903)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						(7,903)us-gaap_StockRepurchasedDuringPeriodValue
Repurchase of Class A common stock (shares) (in Shares)	(187,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Class B common stock converted to Class A common stock	24us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(24)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Class B common stock converted to Class A common stock (shares) (in Shares)	200,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(200,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Compensation for stock and stock option issuances and excess tax benefits from option exercises	2,184us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember			10,199us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			12,383us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Dividends paid						(10,085)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(10,085)us-gaap_Dividends
Balance at Dec. 31, 2013	268,255us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		319us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	22,598us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(1,538)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	245,088us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	534,722us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2013	23,329,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		2,562,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net income						138,720us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	138,720us-gaap_NetIncomeLoss
Gain on cash flow hedges, net of tax expense					612us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember		612us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Issuance of stock in connection with employee stock plans	4,590us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						4,590us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Issuance of stock in connection with employee stock plans (shares) (in Shares)	118,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of stock in connection with acquisitions	19,736us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						19,736us-gaap_StockIssuedDuringPeriodValueAcquisitions
Issuance of stock in connection with acquisitions (in Shares)	269,000us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of restricted stock to employees (shares) (in Shares)	288,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Repurchase of Class A common stock	(22,968)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember						(22,968)us-gaap_StockRepurchasedDuringPeriodValue
Repurchase of Class A common stock (shares) (in Shares)	(333,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Compensation for stock and stock option issuances and excess tax benefits from option exercises	6,445us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember			7,177us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			13,622us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Dividends paid						(15,929)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(15,929)us-gaap_Dividends
Balance at Dec. 31, 2014	$ 276,058us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		$ 319us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 29,775us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (926)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ 367,879us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 673,105us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2014	23,671,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		2,562,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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