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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Income Taxes [Textual] [Abstract]    
Effective Income Tax Rate Reconciliation, Percent 0.00% (3.40%)
Reserve for Uncertain Tax Positions $ 1,631 $ 1,570
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 23  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 235