Income Taxes - Provision for Income Tax Schedule (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax provision:
Federal	$ 153,471us-gaap_CurrentFederalTaxExpenseBenefit	$ 77,671us-gaap_CurrentFederalTaxExpenseBenefit	$ 94,423us-gaap_CurrentFederalTaxExpenseBenefit
State	4,978	8,034	10,046
Foreign	13,259us-gaap_CurrentForeignTaxExpenseBenefit	13,019us-gaap_CurrentForeignTaxExpenseBenefit	18,952us-gaap_CurrentForeignTaxExpenseBenefit
Deferred tax (benefit) provision:
Federal	(13,073)	24,210	(582)
State	(15,220)	(1,106)	(2,045)
Foreign	2,442	1,869	(3,189)
Change in valuation allowance	(29)	2,370	(3)
Total	$ 145,828us-gaap_IncomeTaxExpenseBenefit	$ 126,067us-gaap_IncomeTaxExpenseBenefit	$ 117,602us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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