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Acquisition and Divestiture (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended
Mar. 15, 2017
Nov. 01, 2016
Mar. 31, 2017
Oct. 31, 2016
Business Acquisition [Line Items]        
Proceeds from sale of aircraft $ 1,300      
Gain on sale of asset $ 1,300      
Blackhawk        
Business Acquisition [Line Items]        
Cash payments to acquire business   $ 150,400    
Shares of common stock to acquire business (in shares)   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  
Blackhawk        
Business Acquisition [Line Items]        
Goodwill   $ 192,400