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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Detail of regulatory liabilities |  |
Regulatory liabilities, current | $ 296,271 | $ 229,088
Regulatory liabilities, non-current | 2,499,213 | 2,450,169
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 614,683 | 506,049
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 37,789 | 37,705
Regulatory liabilities, non-current | 337,027 | 349,588
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 69,476 | 52,844
Regulatory liabilities, non-current | 50,104 | 103,008
Deferred fuel and purchased power - mark-to-market |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 60,693 | 0
Regulatory liabilities, non-current | 46,908 | 0
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,876 | 2,839
Regulatory liabilities, non-current | 64,802 | 66,553
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,316 | 5,460
Regulatory liabilities, non-current | 53,076 | 49,435
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 6,701 | 6,768
Regulatory liabilities, non-current | 38,581 | 44,221
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,264 | 2,231
Regulatory liabilities, non-current | 47,337 | 48,648
Renewable energy program |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 38,453 | 39,442
Regulatory liabilities, non-current | 187 | 103
FERC transmission true up |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 21,379 | 6,598
Regulatory liabilities, non-current | 12,924 | 3,008
Property tax deferral |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 4,671 | 0
Regulatory liabilities, non-current | 15,521 | 13,856
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 2,989
Regulatory liabilities, non-current | 13,797 | 11,508
Demand side management |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 10,819
Regulatory liabilities, non-current | 5,417 | 0
Tax expense adjustor mechanism |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 7,089
Regulatory liabilities, non-current | 4,835 | 0
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,301 | 2,423
Regulatory liabilities, non-current | 551 | 1,544
TCA balancing account |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 2,902
Regulatory liabilities, non-current | 0 | 4,672
Active union medical trust |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 0 | 6,057
Other |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 210 | 409
Regulatory liabilities, non-current | 41 | 189
ACC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 40,903 | 41,330
Regulatory liabilities, non-current | 971,545 | 1,012,583
FERC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 7,239 | 7,240
Regulatory liabilities, non-current | $ 221,877 | $ 229,147

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