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Income Taxes - Income Tax Expense (Benefit), 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 (Benefit)      
Federal $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State 269us-gaap_CurrentStateAndLocalTaxExpenseBenefit 257us-gaap_CurrentStateAndLocalTaxExpenseBenefit 348us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 208us-gaap_CurrentForeignTaxExpenseBenefit 70us-gaap_CurrentForeignTaxExpenseBenefit 0us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit) 477us-gaap_CurrentIncomeTaxExpenseBenefit 327us-gaap_CurrentIncomeTaxExpenseBenefit 348us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit)      
Federal 3,933us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,626)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (5,374)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 1,105us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (167)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (1,456)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign 121us-gaap_DeferredForeignIncomeTaxExpenseBenefit 353us-gaap_DeferredForeignIncomeTaxExpenseBenefit (311)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) 5,159us-gaap_DeferredIncomeTaxExpenseBenefit (1,440)us-gaap_DeferredIncomeTaxExpenseBenefit (7,141)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision (benefit) from continuing operations 5,636us-gaap_IncomeTaxExpenseBenefit (1,113)us-gaap_IncomeTaxExpenseBenefit (6,793)us-gaap_IncomeTaxExpenseBenefit
Income tax provision from discontinued operations $ 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 1,097us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 747us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation