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Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal:
Current	$ 49,590us-gaap_CurrentFederalTaxExpenseBenefit	$ 44,785us-gaap_CurrentFederalTaxExpenseBenefit	$ 38,129us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	22,549us-gaap_DeferredFederalIncomeTaxExpenseBenefit	19,773us-gaap_DeferredFederalIncomeTaxExpenseBenefit	14,926us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State:
Current	4,849us-gaap_CurrentStateAndLocalTaxExpenseBenefit	4,231us-gaap_CurrentStateAndLocalTaxExpenseBenefit	3,956us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred	727us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	2,026us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	1,783us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign:
Current	4,638us-gaap_CurrentForeignTaxExpenseBenefit	6,475us-gaap_CurrentForeignTaxExpenseBenefit	1,947us-gaap_CurrentForeignTaxExpenseBenefit
Deferred	(10,957)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	613us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(215)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Provision for income taxes	$ 71,396us-gaap_IncomeTaxExpenseBenefit	$ 77,903us-gaap_IncomeTaxExpenseBenefit	$ 60,526us-gaap_IncomeTaxExpenseBenefit

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