CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net sales	$ 168,559	$ 132,901	$ 311,425	$ 260,565
Operating costs and expenses:
Cost of materials and other	32,547	26,114	60,448	51,441
Direct operating expenses (exclusive of depreciation and amortization)	60,517	46,870	115,003	102,539
Depreciation and amortization	20,861	20,040	38,902	39,331
Cost of sales	113,925	93,024	214,353	193,311
Selling, general and administrative expenses	8,034	6,308	15,922	13,618
Loss on asset disposal	282	5	242	13
Operating income	46,318	33,564	80,908	53,623
Other (expense) income:
Interest expense, net	(7,580)	(7,510)	(15,307)	(15,175)
Other income, net	30	165	255	325
Income before income tax expense	38,768	26,219	65,856	38,773
Income tax benefit	0	0	0	(25)
Net income	$ 38,768	$ 26,219	$ 65,856	$ 38,798
Basic earnings per common unit (in dollars per unit)	$ 3.67	$ 2.48	$ 6.23	$ 3.67
Diluted earnings per common unit (in dollars per unit)	$ 3.67	$ 2.48	$ 6.23	$ 3.67
Weighted-average common units outstanding:
Basic (in units)	10,570	10,570	10,570	10,570
Diluted (in units)	10,570	10,570	10,570	10,570