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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Detail of regulatory liabilities |  |
Regulatory liabilities, current | $ 104,313 | $ 145,766
Regulatory liabilities, non-current | 998,349 | 994,152
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 305,862 | 277,554
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 27,626 | 39,746
Regulatory liabilities, non-current | 237,885 | 240,367
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 33,294 | 34,100
Regulatory liabilities, non-current | 146,988 | 179,521
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 3,774 | 3,604
Regulatory liabilities, non-current | 93,578 | 97,175
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,771 | 1,113
Regulatory liabilities, non-current | 70,233 | 72,454
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 3,051
Regulatory liabilities, non-current | 71,884 | 67,437
Renewable energy standard (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 28,921 | 43,773
Regulatory liabilities, non-current | 1,091 | 4,365
Demand side management (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 4,261 | 6,079
Regulatory liabilities, non-current | 21,863 | 19,115
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 14,885 | 13,678
Deferred fuel and purchased power (b) (c) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 9,688
Regulatory liabilities, non-current | 0 | 0
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,063 | 2,062
Regulatory liabilities, non-current | 9,335 | 6,001
Transmission cost adjustor (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,077 | 0
Regulatory liabilities, non-current | 0 | 0
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 17,213 | 8,920
Other |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 526 | 2,550
Regulatory liabilities, non-current | $ 7,532 | $ 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 The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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