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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Statement of Cash Flows [Abstract]          
Depreciation and amortization $ 44,522 $ 43,296 $ 87,696 $ 86,995  
Special charges     2,592 263,497  
Other adjustments     18,184 81,630  
Air traffic liability     129,220 104,785  
Deferred Payroll Support Programs grant recognition     49,210 62,814  
Other - net     16,175 (196,942)  
Net cash provided by operating activities     404,973 276,666  
Cash flows from investing activities:          
Purchase of investment securities     (673,722) (296,979)  
Proceeds from maturities of investment securities     436,364 258,751  
Purchase of property and equipment     (134,484) (170,673)  
Proceeds from sale-leaseback transactions     0 48,000  
Other investing activities     2,443 2,303  
Net cash used in investing activities     (369,399) (158,598)  
Cash flows from financing activities:          
Cash dividends paid to shareholders     0 (11,361)  
Proceeds from the issuance of debt and finance lease obligations     106,657 175,712  
Repurchase of common stock     0 (33,773)  
Principal payments on debt and finance lease obligations     (199,627) (98,171)  
Debt issuance costs     $ (606) $ (2,852)  
Proceeds from issuance of common stock     335,137 0  
Other financing activities     $ 3,936 $ 3,234  
Net cash provided by financing activities     245,497 32,789  
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH     281,071 150,857  
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 451,390 287,642 451,390 287,642 170,319
CASH PAYMENTS (RECEIPTS) FOR:          
Interest paid, net of amount capitalized     26,379 26,065  
Income tax payments (refunds)     4,873 (45,321)  
Right-of-use (ROU) assets acquired     23,157 86,012  
Flight equipment acquired under finance leases     13,833 0  
Purchases of property and equipment in accrued liabilities     5,088 22,106 $ 16,900
Net Income (Loss) Attributable to Parent $ 95,027 $ (93,103) $ 101,896 $ (126,113)