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Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Mar. 31, 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 $ 301,615 $ 152,764
Restricted cash 25,212 17,555
Short-term investments 426,381 532,477
Accounts receivable 188,116 192,215
Expendable parts, supplies and fuel, net 26,276 24,006
Prepaid expenses and other current assets 32,088 24,616
TOTAL CURRENT ASSETS 999,688 943,633
Property and equipment, net 2,072,211 2,050,311
Deferred major maintenance, net 131,910 127,463
Operating lease right-of-use assets, net 116,998 115,911
Deposits and other assets 24,393 21,607
TOTAL ASSETS: 3,345,200 3,258,925
CURRENT LIABILITIES    
Accounts payable 37,767 34,197
Accrued liabilities 129,795 116,093
Current operating lease liabilities 15,247 14,313
Air traffic liability 403,049 307,508
Current maturities of long-term debt and finance lease obligations, net of related costs 156,482 217,234
TOTAL CURRENT LIABILITIES 742,340 689,345
Long-term debt and finance lease obligations, net of current maturities and related costs 1,459,570 1,441,777
Deferred income taxes 303,390 301,763
Noncurrent operating lease liabilities 103,103 102,289
Other noncurrent liabilities 27,143 24,388
TOTAL LIABILITIES: 2,635,546 2,559,562
SHAREHOLDERS' EQUITY    
Common stock, par value $.001 23 23
Treasury shares (646,008) (646,008)
Additional paid in capital 333,147 329,753
Accumulated other comprehensive income (loss), net 1 (27)
Retained earnings 1,022,491 1,015,622
TOTAL EQUITY: 709,654 699,363
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY: $ 3,345,200 $ 3,258,925