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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
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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)

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