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Leases (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Aircraft
Dec. 31, 2020
USD ($)
Leases [Abstract]    
Operating Leased Assets, Number of Units | Aircraft 13  
Finance Leased Assets, Number of Units | Aircraft 9  
Number Of Aircraft In Sale-Leaseback Transactions | Aircraft 3  
operating right of use asset, net $ 116,998 $ 115,911
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 242,280 133,175
Total Right-of-Use Asset 359,278 249,086
Current operating lease liabilities 15,247 14,313
Finance Lease, Liability, Current 13,358 9,767
Noncurrent operating lease liabilities 103,103 102,289
Finance Lease, Liability, Noncurrent 215,354 117,060
Total Lease Liability 347,062 $ 243,429
Sale Leaseback Transaction, Net Proceeds, Financing Activities $ 105,000