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Business Acquisitions - Schedule of Pro Forma Information (Details) - TIW Corporation - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Revenues $ 49,400 $ 595,797 $ 943,714
Net income $ (15,500) $ 84,756 $ 193,310
Basic earnings per share (in dollars per share)   $ 2.26 $ 5.04
Diluted earnings per share (in dollars per share)   $ 2.25 $ 5.02