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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

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