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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Statement of Cash Flows [Abstract]      
Net income (loss) $ 6,869 $ (33,009)  
Depreciation and amortization 43,174 43,699  
Special charges 1,738 163,360  
Other adjustments 8,318 67,890  
Air traffic liability 95,541 53,885  
Other - net 12,353 (189,508)  
Net cash provided by operating activities 167,993 106,317  
Cash flows from investing activities:      
Purchase of investment securities (89,338) (105,382)  
Proceeds from maturities of investment securities 194,534 130,720  
Purchase of property and equipment (69,499) (134,483)  
Other investing activities (16) 2,283  
Net cash provided by (used in) investing activities 35,681 (106,862)  
Cash flows from financing activities:      
Cash dividends paid to shareholders 0 (11,478)  
Proceeds from the issuance of debt and finance lease obligations 105,000 128,296  
Repurchase of common stock 0 (33,773)  
Principal payments on debt and finance lease obligations (151,517) (62,723)  
Debt issuance costs (649) (2,530)  
Net cash provided by (used in) financing activities (47,166) 17,792  
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 156,508 17,247  
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD 170,319 136,785 $ 136,785
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD 326,827 154,032 170,319
CASH PAYMENTS (RECEIPTS) FOR:      
Interest paid, net of amount capitalized 15,059 12,031  
Income tax payments (refunds) (138) 22  
Right-of-use (ROU) assets acquired 4,733 50,218  
Purchases of property and equipment in accrued liabilities $ 4,064 $ 46,452 $ 16,900