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Income Taxes (Classification of Net Deferred Tax Asset) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]    
Long-term deferred income tax assets $ 12,121 $ 16,228
Long-term deferred income tax liabilities (14,895) (18,874)
Net deferred tax liabilities $ (2,774) $ (2,646)