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Leases (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Aircraft
Jun. 30, 2020
USD ($)
Aircraft
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Leases [Abstract]          
Operating Leased Assets, Number of Units | Aircraft   7      
Finance Leased Assets, Number of Units | Aircraft   5      
Number Of Aircraft In Sale-Leaseback Transactions | Aircraft 4        
operating right of use asset, net $ 99,819 $ 99,819 $ 99,819   $ 22,081
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 108,407 108,407 108,407   111,665
Total Right-of-Use Asset 208,226 208,226 208,226   133,746
Operating Lease, Liability, Current 11,171 11,171 11,171   2,662
Finance Lease, Liability, Current 7,836 7,836 7,836   7,666
Operating Lease, Liability, Noncurrent 90,257 90,257 90,257   21,290
Finance Lease, Liability, Noncurrent 103,969 103,969 103,969   107,930
Total Lease Liability 213,233 $ 213,233 213,233   $ 139,548
Sale Leaseback Transaction, Net Proceeds, Investing Activities 48,000   $ 48,000 $ 0  
Sale and Leaseback Transaction, Gain (Loss), Net $ 30,200