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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Commodity contracts, assets | $ 248,875 | $ 110,389
Commodity contracts, liabilities | (40,737) | (4,690)
Nuclear decommissioning trust | 1,076,088 | 1,294,757
Nuclear decommissioning trust, other | 462,020 | 567,266
Other special use funds | 346,406 | 358,410
Other special use funds, other | 938 | 936
Total assets | 1,671,369 | 1,763,556
Total assets, other | 422,221 | 563,512
Liabilities |  |
Gross derivative liability | (1,543) |
Gross derivative liability, other |  | 3,105
Amount reported on balance sheet | (5,596) | (4,373)
Equity securities |  |
Assets |  |
Nuclear decommissioning trust | 14,174 | 17,482
Nuclear decommissioning trust, other | 1,401 | (27,782)
Other special use funds | 30,031 | 48,506
Other special use funds, other | 938 | 936
U.S. commingled equity funds |  |
Assets |  |
Nuclear decommissioning trust | 460,619 | 595,048
U.S. Treasury debt |  |
Assets |  |
Nuclear decommissioning trust | 211,284 | 240,745
Other special use funds | 310,667 | 298,170
Corporate debt |  |
Assets |  |
Nuclear decommissioning trust | 177,297 | 203,454
Mortgage-backed securities |  |
Assets |  |
Nuclear decommissioning trust | 135,858 | 155,574
Municipal bonds |  |
Assets |  |
Nuclear decommissioning trust | 67,943 | 72,189
Other special use funds | 5,708 | 11,734
Other fixed income |  |
Assets |  |
Nuclear decommissioning trust | 8,913 | 10,265
Level 1 |  |
Assets |  |
Commodity contracts, assets | 0 | 0
Nuclear decommissioning trust | 224,057 | 286,009
Other special use funds | 339,760 | 345,740
Total assets | 563,817 | 631,749
Liabilities |  |
Gross derivative liability | 0 | 0
Level 1 | Equity securities |  |
Assets |  |
Nuclear decommissioning trust | 12,773 | 45,264
Other special use funds | 29,093 | 47,570
Level 1 | U.S. commingled equity funds |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 1 | U.S. Treasury debt |  |
Assets |  |
Nuclear decommissioning trust | 211,284 | 240,745
Other special use funds | 310,667 | 298,170
Level 1 | Corporate debt |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 1 | Mortgage-backed securities |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 1 | Municipal bonds |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Other special use funds | 0 | 0
Level 1 | Other fixed income |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 2 |  |
Assets |  |
Commodity contracts, assets | 281,107 | 115,079
Nuclear decommissioning trust | 390,011 | 441,482
Other special use funds | 5,708 | 11,734
Total assets | 676,826 | 568,295
Liabilities |  |
Gross derivative liability | (94) | (4,740)
Level 2 | Equity securities |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Other special use funds | 0 | 0
Level 2 | U.S. commingled equity funds |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 2 | U.S. Treasury debt |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Other special use funds | 0 | 0
Level 2 | Corporate debt |  |
Assets |  |
Nuclear decommissioning trust | 177,297 | 203,454
Level 2 | Mortgage-backed securities |  |
Assets |  |
Nuclear decommissioning trust | 135,858 | 155,574
Level 2 | Municipal bonds |  |
Assets |  |
Nuclear decommissioning trust | 67,943 | 72,189
Other special use funds | 5,708 | 11,734
Level 2 | Other fixed income |  |
Assets |  |
Nuclear decommissioning trust | 8,913 | 10,265
Level 3 |  |
Assets |  |
Commodity contracts, assets | 8,505 | 0
Nuclear decommissioning trust | 0 | 0
Other special use funds | 0 | 0
Total assets | 8,505 | 0
Liabilities |  |
Gross derivative liability | (3,959) | (2,738)
Level 3 | Equity securities |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Other special use funds | 0 | 0
Level 3 | U.S. commingled equity funds |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 3 | U.S. Treasury debt |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Other special use funds | 0 | 0
Level 3 | Corporate debt |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 3 | Mortgage-backed securities |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Level 3 | Municipal bonds |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Other special use funds | 0 | 0
Level 3 | Other fixed income |  |
Assets |  |
Nuclear decommissioning trust | 0 | 0
Fair Value Measured at Net Asset Value Per Share | U.S. commingled equity funds |  |
Assets |  |
Nuclear decommissioning trust | $ 460,619 | $ 595,048

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