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Discontinued Operations and Assets Held for Sale (Results of Operations Associated with Discontinued Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Discontinued Operations and Assets Held for Sale [Abstract]    
Revenues   $ 129
Income (loss) before income taxes $ (437) 969
Income (loss) from discontinued operations $ (437) $ 969 [1]
[1] Reclassified to conform to current presentation (see Notes A and B).