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Income Taxes - Income Tax Expense Attributable to Continuing Operations (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense:      
Federal $ (340)us-gaap_CurrentFederalTaxExpenseBenefit $ (1,857)us-gaap_CurrentFederalTaxExpenseBenefit $ (5,989)us-gaap_CurrentFederalTaxExpenseBenefit
State 137us-gaap_CurrentStateAndLocalTaxExpenseBenefit 295us-gaap_CurrentStateAndLocalTaxExpenseBenefit (554)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 6,802us-gaap_CurrentForeignTaxExpenseBenefit 6,505us-gaap_CurrentForeignTaxExpenseBenefit 5,690us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit) 6,599us-gaap_CurrentIncomeTaxExpenseBenefit 4,943us-gaap_CurrentIncomeTaxExpenseBenefit (853)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit):      
Federal 14,677us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,136us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,640)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (123)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (7)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (315)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign (82)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (336)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 158us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) 14,472us-gaap_DeferredIncomeTaxExpenseBenefit 1,793us-gaap_DeferredIncomeTaxExpenseBenefit (1,797)us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit), Continuing Operations $ 21,071us-gaap_IncomeTaxExpenseBenefit $ 6,736us-gaap_IncomeTaxExpenseBenefit $ (2,650)us-gaap_IncomeTaxExpenseBenefit