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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Detail of regulatory liabilities |  |
Regulatory liabilities, current | $ 234,912 | $ 165,876
Regulatory liabilities, non-current | 2,267,835 | 2,325,976
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 418,423 | 278,585
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 47,356 | 39,866
Regulatory liabilities, non-current | 136,072 | 177,533
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 37,575 | 37,864
Regulatory liabilities, non-current | 139,634 | 125,903
Income taxes - change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,797 | 2,769
Regulatory liabilities, non-current | 68,265 | 70,069
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 6,676 | 6,503
Regulatory liabilities, non-current | 51,019 | 57,002
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,059 | 1,858
Regulatory liabilities, non-current | 51,704 | 17,871
Income taxes - deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,202 | 2,164
Regulatory liabilities, non-current | 50,034 | 51,120
Renewable energy program |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 39,287 | 44,966
Regulatory liabilities, non-current | 10,300 | 20
Demand side management |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 15,024 | 14,604
Regulatory liabilities, non-current | 24,146 | 4,123
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 5,698 | 1,278
Regulatory liabilities, non-current | 11,319 | 17,228
Property tax deferral |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 7,046 | 2,611
Tax expense adjustor mechanism |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 7,018 | 3,237
Regulatory liabilities, non-current | 0 | 0
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,423 | 4,423
Regulatory liabilities, non-current | 4,163 | 6,581
FERC transmission true up |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,045 | 0
Regulatory liabilities, non-current | 2,004 | 0
Other |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 532 | 42
Regulatory liabilities, non-current | 2,296 | 930
ACC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 59,918 | 0
Regulatory liabilities, non-current | 1,054,053 | 1,272,709
FERC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 6,302 | 6,302
Regulatory liabilities, non-current | $ 237,357 | $ 243,691

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