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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 22,902 | $ 79,016 | $ 68,311
Amortization of accumulated investment tax credits | (345) | (286) | (973)
Amortization of excess deferred income tax | (19,779) | 0 | 0
Flow-through of depreciation items | 712 | 1,147 | 1,227
Earnings attributable to non-controlling interest in Valencia | (3,173) | (5,256) | (5,082)
State income tax, net of federal benefit | 1,358 | 5,398 | 4,537
Impairment of state net operating loss carryforwards | 0 | 819 | (311)
Allowance for equity funds used during construction | (2,185) | (3,331) | (1,732)
Impairment of charitable contribution carryforward | 0 | 909 | 0
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization | 1,367 | (2,225) | (1,877)
Federal income tax rate change | 2,914 | 57,461 | 0
Tax expense (benefit) related to stock compensation awards | 4,647 | (2,324) | 0
Other | (643) | (988) | (822)
Total income taxes (benefit) | $ 7,775 | $ 130,340 | $ 63,278
Effective tax rate | 7.13% | 57.73% | 32.42%
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 13,514 | $ 59,139 | $ 46,501
Amortization of accumulated investment tax credits | (247) | (286) | (973)
Amortization of excess deferred income tax | (19,779) | 0 | 0
Flow-through of depreciation items | 674 | 1,103 | 1,185
Earnings attributable to non-controlling interest in Valencia | (3,173) | (5,256) | (5,082)
State income tax, net of federal benefit | 1,323 | 4,926 | 3,921
Impairment of state net operating loss carryforwards | 0 | 627 | (213)
Allowance for equity funds used during construction | (1,716) | (3,032) | (1,457)
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization | 1,367 | (2,225) | (1,877)
Federal income tax rate change | (683) | 29,606 | 0
Tax expense (benefit) related to stock compensation awards | 3,967 | (1,708) | 0
Other | (1,218) | (1,339) | (1,083)
Total income taxes (benefit) | $ (5,971) | $ 81,555 | $ 40,922
Effective tax rate | (9.28%) | 48.27% | 30.80%
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 14,379 | $ 23,475 | $ 22,928
State income tax, net of federal benefit | 1,454 | 1,198 | 1,132
Federal income tax rate change | 0 | 7,865 | 0
Tax expense (benefit) related to stock compensation awards | 735 | (616) | 0
Other | 312 | (410) | (224)
Total income taxes (benefit) | $ 16,880 | $ 31,512 | $ 23,836
Effective tax rate | 24.65% | 46.98% | 36.40%

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