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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Expendable parts, supplies and fuel, reserve $ 12,597 $ 10,284
Property, plant and equipment, net 3,069,949 3,430,103
Property, plant, and equipment, owned, accumulated depreciation 1,067,194 964,866
Accumulated amortization of other deferred costs 165,333 143,275
Long-term debt and lease obligation, current 454,769 439,937
Debt issuance costs, gross, current 8,287 8,038
Long-term debt and lease obligation 1,611,735 1,819,717
Debt issuance cost, gross, noncurrent $ 8,842 $ 14,477
Treasury stock, common, shares (in shares) 7,172,646 7,232,733
Expendable parts, supplies and fuel, net of reserve of $12,597 and $10,284 $ 36,070 $ 36,335
Accounts receivable $ 90,407 $ 70,743
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) 25,580,445 25,501,823
Common stock, shares, outstanding (in shares) 18,407,799 18,269,090
Variable Interest Entity, Primary Beneficiary [Member]    
Property, plant and equipment, net $ 107,290 $ 129,646
Long-term debt and lease obligation, current 12,787 22,627
Long-term debt and lease obligation $ 94,950 $ 107,737