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Income Taxes Provision (benefit) for income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current Federal Income Tax Expense (Benefit)	$ 33,194us-gaap_CurrentFederalTaxExpenseBenefit	$ 48,500us-gaap_CurrentFederalTaxExpenseBenefit	$ 77,400us-gaap_CurrentFederalTaxExpenseBenefit
Current State and Local Tax Expense (Benefit)	3,614	2,080	1,949
Current Foreign Tax Expense (Benefit)	2,722us-gaap_CurrentForeignTaxExpenseBenefit	2,400us-gaap_CurrentForeignTaxExpenseBenefit	1,800us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense	39,530us-gaap_CurrentIncomeTaxExpenseBenefit	52,980us-gaap_CurrentIncomeTaxExpenseBenefit	81,149us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit)	(22,126)	(13,500)	(12,200)
Deferred State Income Tax Expense (Benefit)	(2,261)	(900)	(1,700)
Deferred Income Tax Expense (Benefit)	(24,387)us-gaap_DeferredIncomeTaxExpenseBenefit	(14,400)us-gaap_DeferredIncomeTaxExpenseBenefit	(13,900)us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit)	$ 15,143us-gaap_IncomeTaxExpenseBenefit	$ 38,580us-gaap_IncomeTaxExpenseBenefit	$ 67,249us-gaap_IncomeTaxExpenseBenefit

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

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

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

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

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