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Leases (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
Aircraft
aircraft
Sep. 30, 2020
aircraft
Dec. 31, 2020
USD ($)
Leases [Abstract]      
Operating Leased Assets, Number of Units | Aircraft 16    
Finance Leased Assets, Number of Units | Aircraft 12    
Number Of Aircraft In Sale-Leaseback Transactions | aircraft 3 7  
operating right of use asset, net $ 124,297   $ 115,911
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 235,759   133,175
Total Right-of-Use Asset 360,056   249,086
Current operating lease liabilities 17,642   14,313
Finance Lease, Liability, Current 14,951   9,767
Noncurrent operating lease liabilities 110,322   102,289
Finance Lease, Liability, Noncurrent 247,035   117,060
Total Lease Liability 389,950   $ 243,429
Sale Leaseback Transaction, Net Proceeds, Financing Activities $ 105,000