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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Expendable parts, supplies and fuel, net of reserve of $6,041 and $4,323 $ 6,041 $ 4,323
Property and equipment (including $84,406 and $187,166 from VIEs, Note 7), net of accumulated depreciation of $696,178 and $598,546 696,178 598,546
PP&E from VIEs 3,991,073 3,258,925
Deferred major maintenance, net of accumulated amortization of $75,177 and $57,022 75,177 57,022
Current maturities of long-term debt and finance lease obligations (including $9,000 and $17,610 from VIEs, Note 7), net of related costs of $385 and $7,527 385 7,527
Current maturities of notes payable, from VIEs 663,045 689,345
Long-term debt and finance lease obligations (including $88,128 and $135,683 from VIEs, Note 7), net of current maturities and related costs of $9,385 and $15,926 $ 9,385 $ 15,926
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 24,763,793 23,097,737
Common stock, shares outstanding 18,111,381 16,405,565
Treasury stock, shares 6,652,412 6,692,172
Current maturities of notes payable, from VIEs $ 663,045 $ 689,345
Variable Interest Entity, Primary Beneficiary [Member]    
Statement of Financial Position [Abstract]    
PP&E from VIEs 84,406 187,166
Current maturities of notes payable, from VIEs 9,000 17,610
Long-term debt from VIEs 88,128 135,683
Long-term debt from VIEs 88,128 135,683
Current maturities of notes payable, from VIEs $ 9,000 $ 17,610