Taxes - Constituents of Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 23,484us-gaap_CurrentFederalTaxExpenseBenefit	$ 8,720us-gaap_CurrentFederalTaxExpenseBenefit	$ 11,284us-gaap_CurrentFederalTaxExpenseBenefit
State	973	721	789
Foreign	4,854us-gaap_CurrentForeignTaxExpenseBenefit	3,167us-gaap_CurrentForeignTaxExpenseBenefit	5,790us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense (benefit), Total	29,311us-gaap_CurrentIncomeTaxExpenseBenefit	12,608us-gaap_CurrentIncomeTaxExpenseBenefit	17,863us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(2,569)	1,580	428
State	7	119	36
Foreign	(837)	6	205
Deferred income tax expense (benefit), Total	(3,399)us-gaap_DeferredIncomeTaxExpenseBenefit	1,705us-gaap_DeferredIncomeTaxExpenseBenefit	669us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit), continuing operations, Total	$ 25,912us-gaap_IncomeTaxExpenseBenefit	$ 14,313us-gaap_IncomeTaxExpenseBenefit	$ 18,532us-gaap_IncomeTaxExpenseBenefit

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

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