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Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Common Stock, Par or Stated Value Per Share $ 0.001 $ 0.001
CURRENT ASSETS    
Cash and cash equivalents $ 418,448 $ 152,764
Restricted cash 32,942 17,555
Short-term investments 767,410 532,477
Accounts receivable 175,388 192,215
Expendable parts, supplies and fuel, net 30,194 24,006
Prepaid expenses and other current assets 32,537 24,616
TOTAL CURRENT ASSETS 1,456,919 943,633
Property and equipment, net 2,116,618 2,050,311
Deferred major maintenance, net 145,296 127,463
Operating lease right-of-use assets, net 128,537 115,911
Deposits and other assets 27,336 21,607
TOTAL ASSETS: 3,874,706 3,258,925
CURRENT LIABILITIES    
Accounts payable 57,143 34,197
Accrued liabilities 182,914 116,093
Current operating lease liabilities 16,940 14,313
Air traffic liability 436,728 307,508
Current maturities of long-term debt and finance lease obligations, net of related costs 144,382 217,234
TOTAL CURRENT LIABILITIES 838,107 689,345
Long-term debt and finance lease obligations, net of current maturities and related costs 1,441,083 1,441,777
Deferred income taxes 310,700 301,763
Noncurrent operating lease liabilities 114,761 102,289
Other noncurrent liabilities 22,921 24,388
TOTAL LIABILITIES: 2,727,572 2,559,562
SHAREHOLDERS' EQUITY    
Common stock, par value $0.001 25 23
Treasury shares (642,177) (646,008)
Additional paid in capital 671,893 329,753
Accumulated other comprehensive loss, net (125) (27)
Retained earnings 1,117,518 1,015,622
TOTAL EQUITY: 1,147,134 699,363
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY: $ 3,874,706 $ 3,258,925