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