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Lease (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Aircraft
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Leases [Abstract]      
Operating Leases, Rent Expense $ 24,600 $ 15,000 $ 12,700
Capital Leased Assets, Number of Units | Aircraft 6    
operating right of use asset, net $ 115,911 22,081  
Finance Lease, Right-of-Use Asset 133,175 111,665  
Total Right-of-Use Asset 249,086 133,746  
Current operating lease liabilities 14,313 2,662  
Finance Lease, Liability, Current 9,767 7,666  
Noncurrent operating lease liabilities 102,289 21,290  
Finance Lease, Liability, Noncurrent 117,060 107,930  
Total Lease Liability $ 243,429 $ 139,548  
Operating Lease, Weighted Average Discount Rate, Percent 5.40% 4.30%  
Finance Lease, Weighted Average Discount Rate, Percent 5.00% 4.40%  
Operating Lease, Weighted Average Remaining Lease Term 8 years 3 months 18 days 9 years 1 month 6 days  
Finance Lease, Weighted Average Remaining Lease Term 7 years 7 months 6 days 9 years 10 months 24 days  
Number of Aircraft In Sale-Leaseback Transactions | Aircraft 8    
Proceeds from sale-leaseback transactions $ 87,580 $ 0 $ 0
Sale and Leaseback Transaction, Gain (Loss), Net $ 53,200