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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Detail of regulatory assets |  |
Regulatory assets, current | $ 203,207 | $ 166,902
Regulatory assets, non-current | 1,304,073 | 1,342,941
Pension |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 660,223 | 733,351
Retired power plant costs |  |
Detail of regulatory assets |  |
Regulatory assets, current | 28,182 | 28,182
Regulatory assets, non-current | 142,503 | 167,164
Income taxes - AFUDC equity |  |
Detail of regulatory assets |  |
Regulatory assets, current | 6,800 | 6,457
Regulatory assets, non-current | 154,974 | 151,467
Deferred fuel and purchased power |  |
Detail of regulatory assets |  |
Regulatory assets, current | 70,137 | 37,164
Regulatory assets, non-current | 0 | 0
Deferred fuel and purchased power - mark-to-market |  |
Detail of regulatory assets |  |
Regulatory assets, current | 36,887 | 31,728
Regulatory assets, non-current | 33,185 | 23,768
Property tax deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 8,569 | 8,569
Regulatory assets, non-current | 58,196 | 66,356
SCR deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 52,644 | 23,276
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 8,077 | 8,077
Regulatory assets, non-current | 32,152 | 40,228
Lost fixed cost recovery (b) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 38,144 | 0
Deferred compensation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 36,464 | 36,523
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,098 | 1,079
Regulatory assets, non-current | 24,981 | 25,522
Lost fixed cost recovery |  |
Detail of regulatory assets |  |
Regulatory assets, current | 26,067 | 32,435
Regulatory assets, non-current | 0 | 0
Palo Verde VIE |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 20,635 | 20,015
Coal reclamation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,546 | 1,546
Regulatory assets, non-current | 17,688 | 15,607
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,637 | 1,637
Regulatory assets, non-current | 12,031 | 13,668
Mead-Phoenix transmission line - contributions in aid of construction |  |
Detail of regulatory assets |  |
Regulatory assets, current | 332 | 332
Regulatory assets, non-current | 9,712 | 10,044
TCA balancing account |  |
Detail of regulatory assets |  |
Regulatory assets, current | 6,324 | 3,860
Regulatory assets, non-current | 2,885 | 772
Tax expense of Medicare subsidy |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,235 | 1,235
Regulatory assets, non-current | 4,940 | 6,176
AG-1 deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 2,787 | 2,654
Regulatory assets, non-current | 2,716 | 5,819
Tax expense adjustor mechanism |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,612 | 0
Regulatory assets, non-current | 0 | 0
Other |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,917 | 1,947
Regulatory assets, non-current | $ 0 | $ 3,185

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