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Income Taxes (Deferred Tax Assets and Liabilities Classified in Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets and liabilities    
Deferred tax assets (under "Other non-current assets") $ 1,338 $ 650
Deferred tax liabilities 1,662 7,069
Net deferred tax liabilities $ (324) $ (6,419)