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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Detail of regulatory liabilities |  |
Current | $ 279,105 | $ 234,912
Non-Current | 2,067,801 | 2,267,835
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Current | 0 | 0
Non-Current | 311,517 | 418,423
Removal costs |  |
Detail of regulatory liabilities |  |
Current | 44,586 | 47,356
Non-Current | 135,450 | 136,072
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Current | 37,575 | 37,575
Non-Current | 130,270 | 139,634
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Current | 6,638 | 6,676
Non-Current | 49,234 | 51,019
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Current | 5,461 | 1,059
Non-Current | 48,405 | 51,704
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Current | 2,802 | 2,797
Non-Current | 51,152 | 68,265
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Current | 2,202 | 2,202
Non-Current | 49,910 | 50,034
Renewable energy standard |  |
Detail of regulatory liabilities |  |
Current | 45,872 | 39,287
Non-Current | 115 | 10,300
Demand side management |  |
Detail of regulatory liabilities |  |
Current | 1,702 | 15,024
Non-Current | 43,423 | 24,146
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Current | 184 | 5,698
Non-Current | 13,515 | 11,319
Active union medical trust |  |
Detail of regulatory liabilities |  |
Current | 0 | 0
Non-Current | 7,986 | 2,041
Deferred property taxes |  |
Detail of regulatory liabilities |  |
Current | 0 | 0
Non-Current | 7,968 | 7,046
Tax expense adjustor mechanism |  |
Detail of regulatory liabilities |  |
Current | 6,615 | 7,018
Non-Current | 0 | 0
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Current | 2,423 | 2,423
Non-Current | 3,577 | 4,163
FERC transmission true up |  |
Detail of regulatory liabilities |  |
Current | 3,304 | 1,045
Non-Current | 1,621 | 2,004
Other |  |
Detail of regulatory liabilities |  |
Current | 284 | 532
Non-Current | 132 | 255
ACC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Current | 113,142 | 59,918
Non-Current | 976,018 | 1,054,053
United States Federal Energy Regulatory Commission | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act |  |
Detail of regulatory liabilities |  |
Current | 6,315 | 6,302
Non-Current | $ 237,508 | $ 237,357

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