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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Statement of Cash Flows [Abstract]          
Net income (loss) $ (29,143) $ 43,929 $ (155,255) $ 171,596  
Depreciation and amortization 45,291 39,436 132,285 114,112  
Special charges     279,114 0  
Other adjustments     89,342 60,135  
Air traffic liability     84,111 55,446  
Other - net     (152,872) (79,862)  
Net cash provided by operating activities     276,725 321,427  
Cash flows from investing activities:          
Purchase of investment securities     (511,667) (397,504)  
Proceeds from maturities of investment securities     421,658 413,038  
Purchase of property and equipment     (198,567) (350,187)  
Proceeds from sale-leaseback transactions     78,185 0  
Other investing activities     1,247 10,647  
Net cash used in investing activities     (209,144) (324,006)  
Cash flows from financing activities:          
Cash dividends paid to shareholders     (11,361) (34,214)  
Proceeds from the issuance of debt     272,548 770,435  
Repurchase of common stock     (33,773) (18,549)  
Principal payments on debt and finance lease obligations     (146,416) (670,148)  
Debt issuance costs     (4,505) (32,592)  
Other financing activities     4,609 325  
Net cash provided by financing activities     81,102 15,257  
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH     148,683 12,678  
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD     136,785 95,911 $ 95,911
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD $ 285,468 $ 108,589 285,468 108,589 136,785
CASH PAYMENTS (RECEIPTS) FOR:          
Interest paid, net of amount capitalized     36,801 53,089  
Income tax refunds     (95,258) (2,227)  
Right-of-use (ROU) assets acquired     103,499 2,213  
Purchases of property and equipment in accrued liabilities     $ 19,294 $ 6,091 $ 16,500