Income Taxes - Deferred Tax Asset (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss	$ 427,245	$ 373,717
Intangible assets	2,958	0
Environmental credit obligations	25,994	771
Other	22,551	18,789
Total deferred tax assets	478,748	393,277
Valuation allowance	(411,422)	(330,251)
Net deferred tax assets	67,326	63,026
Deferred tax liabilities:
Inventory	10,328	5,738
Property and equipment	58,122	64,281
Investment in Laramie Energy	4,522	11,609
Convertible notes	0	2,285
Intangible assets	0	750
Other	0	4,904
Total deferred tax liabilities	72,972	89,567
Total deferred tax liability, net	$ (5,646)	$ (26,541)