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Leases (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
Aircraft
aircraft
Jun. 30, 2020
aircraft
Dec. 31, 2020
USD ($)
Leases [Abstract]      
Operating Leased Assets, Number of Units | Aircraft 16    
Finance Leased Assets, Number of Units | Aircraft 10    
Number Of Aircraft In Sale-Leaseback Transactions | aircraft 3 4  
operating right of use asset, net $ 128,537   $ 115,911
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 239,019   133,175
Total Right-of-Use Asset 367,556   249,086
Current operating lease liabilities 16,940   14,313
Finance Lease, Liability, Current 13,835   9,767
Noncurrent operating lease liabilities 114,761   102,289
Finance Lease, Liability, Noncurrent 225,039   117,060
Total Lease Liability 370,575   $ 243,429
Sale Leaseback Transaction, Net Proceeds, Financing Activities $ 105,000