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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Detail of regulatory liabilities |  |
Regulatory liabilities, current | $ 135,554 | $ 145,766
Regulatory liabilities, non-current | 1,009,418 | 994,152
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 289,485 | 277,554
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 32,473 | 39,746
Regulatory liabilities, non-current | 244,724 | 240,367
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 34,100 | 34,100
Regulatory liabilities, non-current | 171,029 | 179,521
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 3,774 | 3,604
Regulatory liabilities, non-current | 96,940 | 97,175
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,771 | 1,113
Regulatory liabilities, non-current | 71,756 | 72,454
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 31 | 3,051
Regulatory liabilities, non-current | 71,235 | 67,437
Renewable energy standard (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 41,518 | 43,773
Regulatory liabilities, non-current | 3,274 | 4,365
Demand side management (b) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 6,628 | 6,079
Regulatory liabilities, non-current | 19,115 | 19,115
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 14,080 | 13,678
Deferred fuel and purchased power (b) (c) |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 13,083 | 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 | 5,501 | 6,001
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 | 0
Regulatory liabilities, non-current | 14,725 | 8,920
Other |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 114 | 2,550
Regulatory liabilities, non-current | $ 7,554 | $ 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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