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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Detail of regulatory liabilities |  |
Current | $ 231,857 | $ 165,876
Non-Current | 2,287,892 | 2,325,976
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Current | 0 | 0
Non-Current | 359,912 | 278,585
Removal costs |  |
Detail of regulatory liabilities |  |
Current | 50,701 | 39,866
Non-Current | 153,847 | 177,533
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Current | 37,821 | 37,864
Non-Current | 105,214 | 125,903
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Current | 2,164 | 2,164
Non-Current | 50,414 | 51,120
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Current | 2,764 | 2,769
Non-Current | 69,171 | 70,069
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Current | 6,578 | 6,503
Non-Current | 53,769 | 57,002
Renewable energy standard |  |
Detail of regulatory liabilities |  |
Current | 40,639 | 44,966
Non-Current | 4,950 | 20
Demand side management |  |
Detail of regulatory liabilities |  |
Current | 7,191 | 14,604
Non-Current | 24,146 | 4,123
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Current | 1,641 | 1,278
Non-Current | 15,495 | 17,228
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Current | 3,423 | 4,423
Non-Current | 5,372 | 6,581
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Current | 1,858 | 1,858
Non-Current | 17,540 | 17,871
Tax expense adjustor mechanism |  |
Detail of regulatory liabilities |  |
Current | 1,663 | 3,237
Non-Current | 0 | 0
Other |  |
Detail of regulatory liabilities |  |
Current | 461 | 42
Non-Current | 8,213 | 3,541
ACC | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act (a) |  |
Detail of regulatory liabilities |  |
Current | 68,651 | 0
Non-Current | 1,178,216 | 1,272,709
United States Federal Energy Regulatory Commission | Excess deferred income taxes - ACC - Tax Cuts and Jobs Act (a) |  |
Detail of regulatory liabilities |  |
Current | 6,302 | 6,302
Non-Current | $ 241,633 | $ 243,691

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