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Discontinued Operations and Assets Held for Sale (Results of Operations Associated with Discontinued Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Discontinued Operations and Assets Held for Sale [Abstract]      
Revenues $ 854 $ 1,464 $ 381,747
Loss from operations before income taxes (853) (2,027) (6,758)
Loss on sale before income taxes     (4,990)
Total loss from discontinued operations before taxes (853) (2,027) (11,748)
Income tax expense     3,313
Loss from discontinued operations $ (853) $ (2,027) [1] $ (15,061) [1]
[1] Reclassified to conform to current presentation (see Note A).