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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 16,154 $ 70,226 $ 61,274
Amortization of accumulated investment tax credits (1,342) (2,164) (2,192)
Flow-through of depreciation items 1,485 1,344 1,132
Earnings attributable to non-controlling interest in Valencia (5,218) (4,945) (5,082)
State income tax, net of federal benefit (1,781) 5,723 3,818
Impairment of state net operating loss carryforwards 5,278 3,129 0
Impairment of state production tax credits 3,092 894 3,880
Allowance for equity funds used during construction (3,650) (1,947) (1,534)
Reversal of deferred items related to BART at SJGS 1,826 0 0
Impairment of charitable contribution carryforward 2,042 0 0
Other (2,811) (2,522) (1,783)
Total income taxes (benefit) $ 15,075 $ 69,738 $ 59,513
Effective tax rate 32.66% 34.76% 33.99%
Public Service Company of New Mexico [Member]      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ (4,579) $ 53,930 $ 53,018
Amortization of accumulated investment tax credits (1,342) (2,164) (2,192)
Flow-through of depreciation items 1,465 1,325 1,115
Earnings attributable to non-controlling interest in Valencia (5,218) (4,945) (5,082)
State income tax, net of federal benefit (2,162) 5,522 6,202
Impairment of state net operating loss carryforwards 3,619 2,145 0
Allowance for equity funds used during construction (3,650) (1,947) (1,534)
Reversal of deferred items related to BART at SJGS 1,826 0 0
Impairment of charitable contribution carryforward (737) (737) (737)
Other (1,980) (496) (1,986)
Total income taxes (benefit) $ (12,758) $ 52,633 $ 48,804
Effective tax rate 97.52% 34.16% 32.22%
Texas-New Mexico Power Company [Member]      
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 23,131 $ 21,115 $ 16,349
State income tax, net of federal benefit 1,065 1,257 1,247
Other (71) 151 25
Total income taxes (benefit) $ 24,125 $ 22,523 $ 17,621
Effective tax rate 36.50% 37.33% 37.72%