Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets:
Net operating loss carryforwards	$ 439,738	$ 411,726
Goodwill	7,981	13,658
Stock-based compensation	2,040	3,550
Interest expense carryforward	9,388	5,391
Tax credit carryforwards	4,233	6,521
Leases	12,235	7,818
Intangibles	0	1,459
Risk management unrealized loss	377	1,548
Accrued compensation	5,463	4,336
Inventory capitalization	9,648	3,226
Other	5,141	5,235
Deferred tax assets	496,244	464,468
Deferred Tax Liabilities:
Property, plant and equipment	(76,247)	(68,948)
Leases	(12,163)	(7,822)
Convertible debt	0	(3,253)
Intangibles	(10,080)	0
Prepaid expenses	(2,878)	(2,644)
Other	(498)	(622)
Deferred tax liabilities	(101,866)	(83,289)
Net deferred tax assets	394,378	381,179
Valuation allowance	(392,866)	(387,786)	$ (350,902)	$ (283,805)
Net deferred tax assets (liabilities)	$ 1,512
Net deferred tax assets (liabilities)		$ (6,607)