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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Detail of regulatory assets |  |
Regulatory assets, current | $ 140,000 | $ 138,000
Regulatory assets, non-current | 1,102,327 | 1,054,087
Pension benefits |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 498,000 | 485,000
Income taxes — allowance for funds used during construction (AFUDC) equity |  |
Detail of regulatory assets |  |
Regulatory assets, current | 5,000 | 5,000
Regulatory assets, non-current | 132,000 | 118,000
Deferred fuel and purchased power — mark-to-market (Note 7) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 63,000 | 51,000
Regulatory assets, non-current | 73,000 | 46,000
Transmission vegetation management |  |
Detail of regulatory assets |  |
Regulatory assets, current | 7,000 | 9,000
Regulatory assets, non-current | 0 | 5,000
Coal reclamation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 6,000 | 7,000
Palo Verde VIEs (Note 6) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 22,000 | 35,000
Deferred compensation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 36,000 | 34,000
Deferred fuel and purchased power |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 7,000
Regulatory assets, non-current | 0 | 0
Tax expense of Medicare subsidy |  |
Detail of regulatory assets |  |
Regulatory assets, current | 2,000 | 2,000
Regulatory assets, non-current | 12,000 | 14,000
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,000 | 1,000
Regulatory assets, non-current | 15,000 | 16,000
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Regulatory assets, current | 2,000 | 2,000
Regulatory assets, non-current | 49,000 | 46,000
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 7,000 | 7,000
Regulatory assets, non-current | 65,000 | 70,000
Lost fixed cost recovery |  |
Detail of regulatory assets |  |
Regulatory assets, current | 43,000 | 38,000
Regulatory assets, non-current | 0 | 0
Retired power plant costs |  |
Detail of regulatory assets |  |
Regulatory assets, current | 10,000 | 10,000
Regulatory assets, non-current | 130,000 | 136,000
Deferred property taxes |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 46,000 | 30,000
Other |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 6,000
Regulatory assets, non-current | $ 18,000 | $ 12,000

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