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Income Taxes (Classification of Net Deferred Tax Asset) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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

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