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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%

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