Intangible Assets and Liabilities - Schedule of Finite-Lived Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Total intangible assets carrying amount	$ 184,004	$ 189,104
Total intangible liability carrying amount	38,300	38,300
Net intangible assets carrying amount	145,704	150,804
Accumulated amortization	(77,326)	(63,932)
Net intangible assets subject to amortization	68,378	86,872
LTSA
Finite-Lived Intangible Assets [Line Items]
Total intangible liability carrying amount	24,100	24,100
Power supply agreements
Finite-Lived Intangible Assets [Line Items]
Total intangible liability carrying amount	14,200	14,200
Trade name
Finite-Lived Intangible Assets [Line Items]
Total intangible assets carrying amount	0	5,100
Power supply agreements
Finite-Lived Intangible Assets [Line Items]
Total intangible assets carrying amount	$ 184,004	$ 184,004