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Income Tax Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Income tax expense $ 92us-gaap_IncomeTaxExpenseBenefit $ 216us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate (0.80%)us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Federal statutory income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate