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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Expendable parts, supplies and fuel, net of reserve of $4,323 and $2,748 $ 4,323 $ 2,748
Property and equipment (including $187,166 and $195,796 from VIEs, Note 7), net of accumulated depreciation of $598,546 and $484,510 598,546 484,510
PP&E from VIEs 3,258,925 3,010,803
Deferred major maintenance, net of accumulated amortization of $57,022 and $34,423 57,022 34,423
Current maturities of long-term debt and finance lease obligations (including $17,610 and $17,327 from VIEs, Note 7), net of related costs of $7,527 and $5,694 7,527 5,694
Current maturities of notes payable, from VIEs 689,345 612,584
Long-term debt and finance lease obligations (including $135,683 and $159,324 from VIEs, Note 7), net of current maturities and related costs of $15,926 and $17,930 $ 15,926 $ 17,930
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 23,097,737 22,835,715
Common stock, shares outstanding 16,405,565 16,303,262
Treasury stock, shares 6,692,172 6,532,453
Current maturities of notes payable, from VIEs $ 689,345 $ 612,584
Variable Interest Entity, Primary Beneficiary [Member]    
Statement of Financial Position [Abstract]    
PP&E from VIEs 187,166 195,796
Current maturities of notes payable, from VIEs 17,610 17,327
Long-term debt from VIEs 135,683 159,324
Long-term debt from VIEs 135,683 159,324
Current maturities of notes payable, from VIEs $ 17,610 $ 17,327