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Acquisition and Divestitures - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 9 Months Ended
Nov. 01, 2016
Sep. 30, 2017
Aug. 31, 2017
Mar. 31, 2017
Sep. 30, 2017
Oct. 31, 2016
Business Acquisition [Line Items]            
Proceeds from sale of aircraft     $ 4,900 $ 1,300    
Gain on sale of asset   $ 600   $ 1,300    
Proceeds from sale of building   2,700        
Blackhawk            
Business Acquisition [Line Items]            
Goodwill $ 192,400          
Blackhawk            
Business Acquisition [Line Items]            
Cash payments to acquire business $ 150,400          
Shares of common stock to acquire business 12.8          
Total consideration to acquire business $ 294,563       $ 294,563  
Closing share price (in dollars per share)           $ 11.25
Goodwill $ 192,409 $ 192,386     $ 192,386