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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Detail of regulatory liabilities |  |
Regulatory liabilities, current | $ 148,000 | $ 131,000
Regulatory liabilities, non-current | 995,757 | 1,051,196
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 41,000 | 31,000
Regulatory liabilities, non-current | 244,000 | 273,000
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 259,000 | 296,000
Renewable energy standard |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 28,000 | 25,000
Regulatory liabilities, non-current | 21,000 | 23,000
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,000 | 0
Regulatory liabilities, non-current | 70,000 | 72,000
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 3,000 | 5,000
Regulatory liabilities, non-current | 68,000 | 66,000
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,000 | 2,000
Regulatory liabilities, non-current | 7,000 | 8,000
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 3,000 | 4,000
Regulatory liabilities, non-current | 98,000 | 93,000
Deferred fuel and purchased power |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 12,000 | 0
Regulatory liabilities, non-current | 0 | 0
Demand side management |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 17,000 | 31,000
Regulatory liabilities, non-current | 20,000 | 0
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 33,000 | 32,000
Regulatory liabilities, non-current | 181,000 | 199,000
Other |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 8,000 | 1,000
Regulatory liabilities, non-current | $ 28,000 | $ 21,000

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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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