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Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]      
Revenues     $ 11,744
Income from discontinued operations before income taxes     1,770
Income from discontinued operations, net of tax $ 0 $ 0 1,152
Gain from disposal of discontinued operations before income taxes 0 0 33,974
Gain from disposal of discontinued operations, net of tax $ 0 $ 0 $ 22,117