Income Taxes ((Benefit) Provision for Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current Expense:
Federal	$ 45,074us-gaap_CurrentFederalTaxExpenseBenefit	$ 29,034us-gaap_CurrentFederalTaxExpenseBenefit	$ 19,573us-gaap_CurrentFederalTaxExpenseBenefit
State	11,174	9,018	3,508
Foreign	3,203us-gaap_CurrentForeignTaxExpenseBenefit	4,256us-gaap_CurrentForeignTaxExpenseBenefit	1,542us-gaap_CurrentForeignTaxExpenseBenefit
Total current	59,451us-gaap_CurrentIncomeTaxExpenseBenefit	42,308us-gaap_CurrentIncomeTaxExpenseBenefit	24,623us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (Benefit) Expense:
Federal	9,992	9,547	(28,157)
State	10,059	577	1,104
Foreign		(113)	(12)
Total deferred	20,051us-gaap_DeferredIncomeTaxExpenseBenefit	10,011us-gaap_DeferredIncomeTaxExpenseBenefit	(27,065)us-gaap_DeferredIncomeTaxExpenseBenefit
Total (benefit) provision	$ 79,502us-gaap_IncomeTaxExpenseBenefit	$ 52,319us-gaap_IncomeTaxExpenseBenefit	$ (2,442)us-gaap_IncomeTaxExpenseBenefit

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