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Transactions with Affiliates (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Transactions with Affiliates [Abstract]        
Billings to affiliates $ 438,326   $ 1,245,020  
Affiliated entities        
Transactions with Affiliates [Abstract]        
Affiliate billings to us 18 $ 16 58 $ 52
Billings to affiliates 1 1 4 3
Rentals paid to affiliate 121 137 365 462
Fees paid to Bencap $ 0 $ 0 $ 0 $ 108
Bencap LLC        
Related Party Transaction [Line Items]        
Percentage of equity method investment 0.00%   0.00%