Intangible Assets, Intangible Liabilities, and Goodwill - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 184,004	$ 189,104
Intangible liabilities, gross	38,300	38,300
Net intangible assets carrying amount	145,704	150,804
Accumulated amortization	(82,466)	(63,932)
Net intangible assets subject to amortization	63,238	86,872
LTSA
Finite-Lived Intangible Assets [Line Items]
Intangible liabilities, gross	24,100	24,100
Power supply agreements
Finite-Lived Intangible Assets [Line Items]
Intangible liabilities, gross	14,200	14,200
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	0	5,100
Power supply agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 184,004	$ 184,004