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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Related Party Transactions [Abstract]        
Maximum percentage of interest on amounts due from affiliates (percent)     6.79%  
Payment of aircraft related expenses $ 1.7 $ 1.5 $ 3.9 $ 3.7