Income Tax - Components of Net Deferred Income Tax (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred income tax assets:
Property, plant & equipment	$ 58,226	$ 69,895
Net operating loss carryforward	180,902	179,627
Disallowed interest expense	7,494	5,580
Accrued liabilities	2,597	2,180
Other	4,993	4,093
Total deferred income tax assets:	254,212	261,375
Valuation allowance	0	0
Net deferred income tax assets	254,212	261,375
Deferred income tax liabilities:
Derivatives	1,603	6,319
Other	1,009	1,260
Total deferred income tax liabilities	2,612	7,579
Net deferred income taxes	$ 251,600	$ 253,796