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Income Taxes (Classification of Net Deferred Tax Asset) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Long-term deferred income tax assets $ 16,228 $ 10,542
Long-term deferred income tax liabilities (18,874) (9,760)
Net deferred tax assets (liabilities) $ (2,646) $ 782