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Stockholders' Investment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 197,468 $ 556,439
Net Income (19,943) 900
Share-based compensation 610 549
Issuance of restricted stock units, net of taxes paid (195) (164)
Tax deficiency on share-based compensation 0 (253)
Ending balance $ 177,940 $ 557,471