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Income Taxes Components of income tax (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income (loss) from continuing operations before income taxes      
United States $ (4,355)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (6,255)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (36,808)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Canada (1,479)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (867)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (9,290)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (loss) from continuing operations before income taxes (5,834)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (7,122)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (46,098)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current income tax expense (benefit):      
U.S. Federal (377)us-gaap_CurrentFederalTaxExpenseBenefit (864)us-gaap_CurrentFederalTaxExpenseBenefit (740)us-gaap_CurrentFederalTaxExpenseBenefit
U.S. state 79us-gaap_CurrentStateAndLocalTaxExpenseBenefit 84us-gaap_CurrentStateAndLocalTaxExpenseBenefit 215us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Canada 525us-gaap_CurrentForeignTaxExpenseBenefit 639us-gaap_CurrentForeignTaxExpenseBenefit 1,016us-gaap_CurrentForeignTaxExpenseBenefit
Total 227us-gaap_CurrentIncomeTaxExpenseBenefit (141)us-gaap_CurrentIncomeTaxExpenseBenefit 491us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit):      
U.S. Federal 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 16,159us-gaap_DeferredFederalIncomeTaxExpenseBenefit
U.S. state 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,160us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Canada 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit 125us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total 0us-gaap_DeferredIncomeTaxExpenseBenefit 0us-gaap_DeferredIncomeTaxExpenseBenefit 17,444us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit):      
U.S. Federal (377)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations (864)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 15,419us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
U.S. state 79us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 84us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,375us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Canada 525us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 639us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 1,141us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Total $ 227us-gaap_IncomeTaxExpenseBenefit $ (141)us-gaap_IncomeTaxExpenseBenefit $ 17,935us-gaap_IncomeTaxExpenseBenefit