Income Tax - Components of Net Deferred Income Tax (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax assets:
Property, plant & equipment	$ 69,895	$ 82,152
Net operating loss carryforward	179,627	183,050
Derivatives		4,800
Disallowed interest expense	5,580	7,467
Accrued liabilities	2,180	2,008
Other	4,093	7,103
Total deferred income tax assets	261,375	286,580
Valuation allowance		(284,928)
Net deferred income tax assets	261,375	1,652
Deferred income tax liabilities:
Derivatives	6,319	0
Other	1,260	1,652
Total deferred income tax liabilities	7,579	1,652
Net deferred income taxes	$ 253,796	$ 0