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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Expendable parts, supplies and fuel, reserve $ 10,284 $ 8,079
Property, plant and equipment, net 3,447,111 2,810,693
Property, plant, and equipment, owned, accumulated depreciation 964,866 814,837
Accumulated amortization of other deferred costs 143,275 108,779
Long-term debt and lease obligation, current 439,937 152,900
Debt issuance costs, gross, current 8,038 6,599
Long-term debt and lease obligation 1,819,717 1,944,078
Debt issuance cost, gross, noncurrent $ 14,477 $ 16,866
Treasury stock, common, shares (in shares) 7,232,733 6,958,096
Expendable parts, supplies and fuel, net of reserve of $10,284 and $8,079 $ 36,335 $ 35,546
Accounts receivable $ 70,743 $ 106,578
Common Stock    
Common stock, par or stated value per share (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares, issued (in shares) 25,501,823 25,086,278
Common stock, shares, outstanding (in shares) 18,269,090 18,128,182
Variable Interest Entity, Primary Beneficiary [Member]    
Property, plant and equipment, net $ 129,646 $ 80,591
Long-term debt and lease obligation, current 22,627 9,315
Long-term debt and lease obligation $ 107,737 $ 69,812