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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
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%