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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 79,016 | $ 68,311 | $ 16,154
Amortization of accumulated investment tax credits | (286) | (973) | (1,342)
Flow-through of depreciation items | 1,147 | 1,227 | 1,485
Earnings attributable to non-controlling interest in Valencia | (5,256) | (5,082) | (5,218)
State income tax, net of federal benefit | 5,398 | 4,537 | (1,781)
Impairment of state net operating loss carryforwards | 819 | (311) | 5,278
Impairment of state production tax credits | 0 | 0 | 3,092
Allowance for equity funds used during construction | (3,331) | (1,732) | (3,650)
Reversal of deferred items related to BART at SJGS | 0 | 0 | 1,826
Impairment of charitable contribution carryforward | 909 | 0 | 2,042
Regulatory recovery of prior year impairments of state net operating loss carryforward, net of amortization | (2,225) | (1,877) | 0
Federal income tax rate change | 57,461 | 0 | 0
Excess tax benefits related to stock compensation awards | (2,324) | 0 | 0
Other | (988) | (822) | (2,811)
Total income taxes (benefit) | $ 130,340 | $ 63,278 | $ 15,075
Effective tax rate | 57.73% | 32.42% | 32.66%
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 59,139 | $ 46,501 | $ (4,579)
Amortization of accumulated investment tax credits | (286) | (973) | (1,342)
Flow-through of depreciation items | 1,103 | 1,185 | 1,465
Earnings attributable to non-controlling interest in Valencia | (5,256) | (5,082) | (5,218)
State income tax, net of federal benefit | 4,926 | 3,921 | (2,162)
Impairment of state net operating loss carryforwards | 627 | (213) | 3,619
Allowance for equity funds used during construction | (3,032) | (1,457) | (3,650)
Reversal of deferred items related to BART at SJGS | 0 | 0 | 1,826
Regulatory recovery of prior year impairments of state net operating loss carryforward, net of amortization | (2,225) | (1,877) | 0
Federal income tax rate change | 29,606 | 0 | 0
Excess tax benefits related to stock compensation awards | (1,708) | 0 | 0
Other | (1,339) | (1,083) | (2,717)
Total income taxes (benefit) | $ 81,555 | $ 40,922 | $ (12,758)
Effective tax rate | 48.27% | 30.80% | 97.52%
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 23,475 | $ 22,928 | $ 23,131
State income tax, net of federal benefit | 1,198 | 1,132 | 1,065
Federal income tax rate change | 7,865 | 0 | 0
Excess tax benefits related to stock compensation awards | (616) | 0 | 0
Other | (410) | (224) | (71)
Total income taxes (benefit) | $ 31,512 | $ 23,836 | $ 24,125
Effective tax rate | 46.98% | 36.39% | 36.50%

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