Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Operating Revenues	$ 69,867	$ 68,319	$ 132,637	$ 129,528
Costs and Expenses:
Operating	49,520	37,730	97,619	76,239
Administrative and general	10,889	13,704	22,806	25,336
Lease expense	486	698	967	1,418
Depreciation and amortization	12,939	13,575	25,821	27,337
Costs and expenses	73,834	65,707	147,213	130,330
Gains on Asset Dispositions and Impairments, Net	37	265	36	3,864
Operating (Loss) Income	(3,930)	2,877	(14,540)	3,062
Other Income (Expense):
Interest income	445	422	1,038	882
Interest expense	(10,190)	(8,736)	(20,499)	(17,524)
Derivative gains (losses), net	104	0	(439)	0
Foreign currency losses, net	(560)	(603)	(640)	(1,428)
Other, net	0	0	(95)	0
Nonoperating income expense	(10,201)	(8,917)	(20,635)	(18,070)
Loss Before Income Tax (Benefit) Expense and Equity in Earnings (Losses) of 50% or Less Owned Companies	(14,131)	(6,040)	(35,175)	(15,008)
Income Tax (Benefit) Expense	(682)	(1,096)	243	61
Loss Before Equity in Earnings (Losses) of 50% or Less Owned Companies	(13,449)	(4,944)	(35,418)	(15,069)
Equity in Earnings (Losses) of 50% or Less Owned Companies	966	373	(134)	909
Net Loss	$ (12,483)	$ (4,571)	$ (35,552)	$ (14,160)
Net Loss Per Share:
Basic	$ (0.45)	$ (0.17)	$ (1.29)	$ (0.52)
Diluted	$ (0.45)	$ (0.17)	$ (1.29)	$ (0.52)
Weighted Average Common Stock and Warrants Outstanding:
Basic	27,729,033	27,137,873	27,536,319	26,981,004
Diluted	27,729,033	27,137,873	27,536,319	26,981,004