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Business Acquisitions - Schedule of Pro Forma Information (Details) - TIW Corporation [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition [Line Items]      
Revenues $ 163,919 $ 25,700 $ 351,979
Net income $ 37,916 $ (8,700) $ 74,653
Basic earnings per share (in dollars per share) $ 1.01   $ 1.98
Diluted earnings per share (in dollars per share) $ 1.01   $ 1.98