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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES:      
Net income (loss) $ (184,093,000) $ 232,117,000 $ 161,802,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 176,267,000 155,852,000 129,351,000
(Gain)/loss on aircraft and other equipment disposals (1,811,000) (8,475,000) 2,360,000
Special charges 292,790,000 0 0
Share-based compensation expense 19,287,000 18,226,000 15,098,000
Deferred income taxes 69,344,000 68,466,000 38,222,000
Other adjustments 19,136,000 5,521,000 4,541,000
Changes in certain assets and liabilities:      
Accounts receivable 4,390,000 10,498,000 35,624,000
Tax receivable (164,585,000) 0 0
Prepaid expenses 10,224,000 (5,483,000) (5,191,000)
Accounts payable 7,016,000 (2,103,000) 8,633,000
Accrued liabilities (26,386,000) 21,331,000 12,005,000
Air traffic liability 57,558,000 37,720,000 7,931,000
Deferred major maintenance 40,352,000 81,133,000 49,622,000
Other assets/liabilities (4,163,000) (10,327,000) (4,142,000)
Net cash provided by operating activities 234,622,000 442,210,000 356,612,000
INVESTING ACTIVITIES:      
Purchase of investment securities (686,600,000) (436,237,000) (371,461,000)
Proceeds from maturity and sale of investment securities 504,600,000 454,813,000 436,581,000
Purchase of property and equipment, including capitalized interest (281,159,000) (506,845,000) (334,774,000)
Proceeds from sale-leaseback transactions 87,580,000 0 0
Other investing activities 9,888,000 11,806,000 677,000
Net cash used in investing activities (365,691,000) (476,463,000) (268,977,000)
FINANCING ACTIVITIES:      
Cash dividends paid to shareholders(1) (11,361,000) (45,552,000) (45,247,000)
Proceeds from the issuance of debt 427,987,000 874,936,000 211,225,000
Repurchase of common stock (33,773,000) (18,569,000) (3,650,000)
Principal payments on debt and finance lease obligations (217,766,000) (705,763,000) (232,227,000)
Debt issuance costs (7,203,000) (33,333,000) (1,666,000)
Other financing activities 6,719,000 3,408,000 9,202,000
Net cash provided by (used in) financing activities 164,603,000 75,127,000 (62,363,000)
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 33,534,000 40,874,000 25,272,000
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD 136,785,000 95,911,000 70,639,000
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD 170,319,000 136,785,000 95,911,000
CASH PAYMENTS/(RECEIPTS) FOR:      
Interest paid, net of amount capitalized 48,002,000 65,152,000 52,323,000
Income tax refunds (95,229,000) (2,157,000) (41,610,000)
Right-of-use (ROU) assets acquired 115,082,000 2,510,000 0
Property capitalized under operating leases 19,294,000 25,830,000 0
Flight equipment acquired under finance leases $ 27,765,000 $ 0 $ 127,625,000