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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net Income $ 19,725us-gaap_NetIncomeLoss $ 21,767us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:    
Foreign currency translation adjustments, net of tax of $165 and ($15) for the three months ended March 31,2015 and 2014, respectively (271)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 24us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized gains on available-for-sale securities, net of tax of ($1) and $($40) for the three months ended March 31, 2015 and 2014, respectively 4us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 63us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Other comprehensive (loss) income (267)us-gaap_OtherComprehensiveIncomeLossNetOfTax 87us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income 19,458us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 21,854us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive (income) loss attributable to noncontrolling interests (383)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 171us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to common stockholders $ 19,075us-gaap_ComprehensiveIncomeNetOfTax $ 22,025us-gaap_ComprehensiveIncomeNetOfTax