Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Operating Revenues	$ 60,810	$ 69,867	$ 116,309	$ 132,637
Costs and Expenses:
Operating	49,493	49,520	91,421	97,619
Administrative and general	11,998	10,889	23,484	22,806
Lease expense	325	486	662	967
Depreciation and amortization	12,090	12,939	24,900	25,821
Costs and expenses	73,906	73,834	140,467	147,213
Gains on Asset Dispositions and Impairments, Net	19,163	37	24,972	36
Operating Income (Loss)	6,067	(3,930)	814	(14,540)
Other Income (Expense):
Interest income	372	445	808	1,038
Interest expense	(8,844)	(10,190)	(18,430)	(20,499)
Derivative gains (losses), net	87	104	212	(439)
Foreign currency losses, net	(2,119)	(560)	(3,315)	(640)
Other, net	0	0	0	(95)
Nonoperating income (expense)	(10,504)	(10,201)	(20,725)	(20,635)
Loss Before Income Tax Expense (Benefit) and Equity in Earnings (Losses) of 50% or Less Owned Companies	(4,437)	(14,131)	(19,911)	(35,175)
Income Tax Expense (Benefit)	2,508	(682)	3,412	243
Loss Before Equity in Earnings (Losses) of 50% or Less Owned Companies	(6,945)	(13,449)	(23,323)	(35,418)
Equity in Earnings (Losses) of 50% or Less Owned Companies	218	966	1,107	(134)
Net Loss	$ (6,727)	$ (12,483)	$ (22,216)	$ (35,552)
Net Loss Per Share:
Basic	$ (0.26)	$ (0.45)	$ (0.83)	$ (1.29)
Diluted	$ (0.26)	$ (0.45)	$ (0.83)	$ (1.29)
Weighted Average Common Stock and Warrants Outstanding:
Basic	25,686,560	27,729,033	26,791,291	27,536,319
Diluted	25,686,560	27,729,033	26,791,291	27,536,319