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