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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 68,311 | $ 16,154 | $ 70,226
Amortization of accumulated investment tax credits | (973) | (1,342) | (2,164)
Flow-through of depreciation items | 1,227 | 1,485 | 1,344
Earnings attributable to non-controlling interest in Valencia | (5,082) | (5,218) | (4,945)
State income tax, net of federal benefit | 4,537 | (1,781) | 5,723
Impairment of state net operating loss carryforwards | (311) | 5,278 | 3,129
Impairment of state production tax credits | 0 | 3,092 | 894
Allowance for equity funds used during construction | (1,732) | (3,650) | (1,947)
Reversal of deferred items related to BART at SJGS | 0 | 1,826 | 0
Impairment of charitable contribution carryforward | 0 | 2,042 | 0
Regulatory recovery of prior year impairment of state net operating loss carryforward, net of amortization | (1,877) | 0 | 0
Other | (822) | (2,811) | (2,522)
Total income taxes (benefit) | $ 63,278 | $ 15,075 | $ 69,738
Effective tax rate | 32.42% | 32.66% | 34.76%
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 46,501 | $ (4,579) | $ 53,930
Amortization of accumulated investment tax credits | (973) | (1,342) | (2,164)
Flow-through of depreciation items | 1,185 | 1,465 | 1,325
Earnings attributable to non-controlling interest in Valencia | (5,082) | (5,218) | (4,945)
State income tax, net of federal benefit | 3,921 | (2,162) | 5,522
Impairment of state net operating loss carryforwards | (213) | 3,619 | 2,145
Allowance for equity funds used during construction | (1,457) | (3,650) | (1,947)
Reversal of deferred items related to BART at SJGS | 0 | 1,826 | 0
Impairment of charitable contribution carryforward | (301) | (737) | (737)
Regulatory recovery of prior year impairment of state net operating loss carryforward, net of amortization | (1,877) | 0 | 0
Other | (782) | (1,980) | (496)
Total income taxes (benefit) | $ 40,922 | $ (12,758) | $ 52,633
Effective tax rate | 30.80% | 97.52% | 34.16%
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 22,928 | $ 23,131 | $ 21,115
State income tax, net of federal benefit | 1,132 | 1,065 | 1,257
Other | (224) | (71) | 151
Total income taxes (benefit) | $ 23,836 | $ 24,125 | $ 22,523
Effective tax rate | 36.39% | 36.50% | 37.33%

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