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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Detail of regulatory liabilities |  |
Regulatory liabilities, current | $ 116,172 | $ 145,766
Regulatory liabilities, non-current | 1,010,821 | 994,152
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 299,713 | 277,554
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 26,373 | 39,746
Regulatory liabilities, non-current | 245,777 | 240,367
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 33,294 | 34,100
Regulatory liabilities, non-current | 155,279 | 179,521
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 3,774 | 3,604
Regulatory liabilities, non-current | 95,877 | 97,175
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,771 | 1,113
Regulatory liabilities, non-current | 71,257 | 72,454
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 31 | 3,051
Regulatory liabilities, non-current | 71,342 | 67,437
Renewable energy standard (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 35,882 | 43,773
Regulatory liabilities, non-current | 2,182 | 4,365
Demand side management (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 4,957 | 6,079
Regulatory liabilities, non-current | 21,864 | 19,115
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 14,483 | 13,678
Deferred fuel and purchased power (b) (c) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,439 | 9,688
Regulatory liabilities, non-current | 0 | 0
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,062 | 2,062
Regulatory liabilities, non-current | 9,535 | 6,001
Transmission cost adjustor (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 5,545 | 0
Regulatory liabilities, non-current | 0 | 0
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 15,969 | 8,920
Other |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 44 | 2,550
Regulatory liabilities, non-current | $ 7,543 | $ 7,565

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- Definition The amount for the individual regulatory current liability including deferred fuel and purchased power as itemized in a table of regulatory current liabilities as of the end of the period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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