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Income Taxes - Income Tax Expense (Benefit) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]      
Current federal tax expense (benefit) $ 325us-gaap_CurrentFederalTaxExpenseBenefit $ 1,793us-gaap_CurrentFederalTaxExpenseBenefit $ 715us-gaap_CurrentFederalTaxExpenseBenefit
Deferred federal income tax expense (benefit) (623)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (497)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,036us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal income tax expense (benefit), continuing operations (298)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 1,296us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 2,751us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Current state and local tax expense (benefit) (2)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 242us-gaap_CurrentStateAndLocalTaxExpenseBenefit 146us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred state and local income tax expense (benefit) 1,036us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (52)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 254us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State and local income tax expense (benefit), continuing operations 1,034us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 190us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 400us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Current foreign tax expense (benefit) 1,640us-gaap_CurrentForeignTaxExpenseBenefit 901us-gaap_CurrentForeignTaxExpenseBenefit 249us-gaap_CurrentForeignTaxExpenseBenefit
Deferred foreign income tax expense (benefit) (1,092)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (237)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (137)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign income tax expense (benefit), continuing operations 548us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 664us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 112us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Current income tax expense (benefit) 1,963us-gaap_CurrentIncomeTaxExpenseBenefit 2,936us-gaap_CurrentIncomeTaxExpenseBenefit 1,110us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) (679)us-gaap_DeferredIncomeTaxExpenseBenefit (786)us-gaap_DeferredIncomeTaxExpenseBenefit 2,153us-gaap_DeferredIncomeTaxExpenseBenefit
Net income tax expense $ 1,284us-gaap_IncomeTaxExpenseBenefit $ 2,150us-gaap_IncomeTaxExpenseBenefit $ 3,263us-gaap_IncomeTaxExpenseBenefit