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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Expendable parts, supplies and fuel, reserve	$ 8,079	$ 6,041
Property, plant and equipment, net	2,810,693	2,259,507
Property, plant, and equipment, owned, accumulated depreciation	814,837	696,178
Accumulated amortization of other deferred costs	108,779	75,177
Long-term debt and lease obligation, current	152,900	130,053
Debt issuance costs, gross, current	6,599	7,751
Long-term debt and lease obligation	1,944,078	1,612,486
Debt issuance cost, gross, noncurrent	$ 16,866	$ 15,664
Treasury Stock, Shares	6,958,096	6,652,412
Common Stock
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	25,086,278	24,763,793
Common stock, shares issued	18,128,182	18,111,381
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	$ 80,591	$ 84,406
Long-term debt and lease obligation, current	9,315	9,000
Long-term debt and lease obligation	$ 69,812	$ 79,127

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