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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Discontinued Operations and Assets Held for Sale [Abstract]      
Revenues $ 6 $ 854 $ 1,464
Loss from operations before income taxes (3,522) (853) (2,027)
Total loss from discontinued operations before taxes (3,522) (853) (2,027)
Income (loss) from discontinued operations $ (3,522) $ (853) [1] $ (2,027) [1]
[1] Reclassified to conform to current presentation (see Note B).