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Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]      
Loss from disposal of discontinued operations before income taxes $ 21,983 $ 0 $ 0
Loss from disposal of discontinued operations, net of tax $ 17,367 $ 0 $ 0