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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 43,670 | $ 14,038 | $ 22,902
Amortization of accumulated investment tax credits | (890) | (522) | (345)
Amortization of excess deferred income tax | (30,723) | (37,799) | (19,779)
Flow-through of depreciation items | 1,368 | 1,136 | 712
Earnings attributable to non-controlling interest in Valencia | (2,943) | (2,991) | (3,173)
State income tax, net of federal benefit | 6,961 | 298 | 1,358
Impairment of state net operating loss carryforwards | 0 | 0 | 0
Allowance for equity funds used during construction | (2,363) | (1,990) | (2,185)
Impairment of charitable contribution carryforward | 0 | 0 | 0
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization | 1,367 | 1,367 | 1,367
Federal income tax rate change | 0 | 0 | 2,914
Tax expense (benefit) related to stock compensation awards | (392) | (795) | 4,647
Non-deductible compensation | 2,630 | 1,156 | 891
Other | 1,951 | 820 | (1,534)
Total income taxes (benefit) | $ 20,636 | $ (25,282) | $ 7,775
Effective tax rate | 9.92% | (37.82%) | 7.13%
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 38,193 | $ 6,187 | $ 13,514
Amortization of accumulated investment tax credits | (243) | (247) | (247)
Amortization of excess deferred income tax | (21,609) | (28,923) | (19,779)
Flow-through of depreciation items | 1,279 | 1,077 | 674
Earnings attributable to non-controlling interest in Valencia | (2,943) | (2,991) | (3,173)
State income tax, net of federal benefit | 7,111 | 92 | 1,323
Impairment of state net operating loss carryforwards | 0 | 0 | 0
Allowance for equity funds used during construction | (1,461) | (1,398) | (1,716)
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization | 1,367 | 1,367 | 1,367
Federal income tax rate change | 0 | 0 | (683)
Tax expense (benefit) related to stock compensation awards | (279) | (559) | 3,967
Non-deductible compensation | 1,554 | 683 | 612
Other | (1,112) | (1,250) | (1,830)
Total income taxes (benefit) | $ 21,857 | $ (25,962) | $ (5,971)
Effective tax rate | 12.02% | (88.13%) | (9.28%)
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Federal income tax at statutory rates | $ 13,628 | $ 12,778 | $ 14,379
Amortization of excess deferred income tax | (9,113) | (8,876) | 0
State income tax, net of federal benefit | 1,625 | 1,532 | 1,454
Tax expense (benefit) related to stock compensation awards | (112) | (236) | 735
Non-deductible compensation | 1,071 | 471 | 277
Other | (791) | (623) | 35
Total income taxes (benefit) | $ 6,308 | $ 5,046 | $ 16,880
Effective tax rate | 9.71% | 8.29% | 24.65%

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120384911&loc=d3e23163-113944 + Details
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