CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net sales	$ 681,477	$ 835,584	$ 532,581
Operating costs and expenses:
Cost of materials and other	134,377	130,913	98,345
Direct operating expenses (exclusive of depreciation and amortization)	234,916	270,167	198,714
Depreciation and amortization	79,720	82,137	73,480
Cost of sales	449,013	483,217	370,539
Selling, general and administrative expenses	29,523	32,192	26,615
Loss on asset disposal	1,533	263	948
Operating income	201,408	319,912	134,479
Other (expense) income:
Interest expense, net	(28,653)	(34,065)	(60,978)
Other (expense) income, net	(33)	1,114	4,711
Income before income tax expense	172,722	286,961	78,212
Income tax expense	289	160	57
Net income	$ 172,433	$ 286,801	$ 78,155
Basic earnings per common unit (in dollars per unit)	$ 16.31	$ 27.07	$ 7.31
Diluted earnings per common unit (in dollars per unit)	$ 16.31	$ 27.07	$ 7.31
Weighted-average common units outstanding:
Basic (in units)	10,570	10,593	10,685
Diluted (in units)	10,570	10,593	10,685