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Change in Net Deferred Tax Asset (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Change In Net Deferred Tax Asset (Liability) [Rollforward]    
Deferred Tax Assets (Liabilities), Net $ 1,280 $ 195
Deferred Tax (Expense) Benefit Related To Continuing Operations (356) (461)
Deferred Taxes, Stockholders' Equity For Change In Accumulated Other Comprehensive (Income) Loss (135) 1,546
Deferred Tax Assets (Liabilities), Net $ 789 $ 1,280