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Related Parties - Summary of Transactions with Polar (Details) - Polar [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]          
Revenue from related party $ 82,858 $ 99,889 $ 159,092 $ 198,356  
Ground handling and airport fees to Polar 1,067 $ 545 1,593 $ 1,063  
Receivables from related party 26,370   26,370   $ 10,855
Payables to related party 1,841   1,841   2,161
Aggregate Carrying Value of Polar Investment $ 4,870   $ 4,870   $ 4,870