Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Leased Assets [Line Items]
Operating Lease Cost - Purchased Power Lease Contracts	$ 40,453	$ 33,709	$ 45,229	$ 38,281
Variable lease, cost	47,994	42,662	64,724	61,304
Short-term lease cost	7,403	2,201	8,804	3,503
Purchased Power Lease Contracts
Operating Leased Assets [Line Items]
Operating Lease Cost - Purchased Power Lease Contracts	35,655	29,140	35,655	29,140
Land, Property and Equipment Leases
Operating Leased Assets [Line Items]
Operating Lease Cost - Purchased Power Lease Contracts	4,798	4,569	9,574	9,141
Total lease cost	$ 95,850	$ 78,572	$ 118,757	$ 103,088