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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating loss | $ 160,901 | $ 161,691
Regulatory liabilities related to income taxes | 64,657 | 80,031
Federal tax credit carryforwards | 78,675 | 77,417
Shutdown of SJGS Units 2 and 3 | 53,434 | 53,823
Other | 75,805 | 70,749
Total deferred tax assets | 433,472 | 443,711
Deferred tax liabilities: |  |
Depreciation and plant related | (1,102,458) | (1,027,047)
Investment tax credit | (56,017) | (56,589)
Regulatory assets related to income taxes | (66,378) | (71,054)
CTC | (12,715) | (16,151)
Pension | (57,287) | (65,226)
Other | (79,267) | (85,037)
Total deferred tax liabilities | (1,374,122) | (1,321,104)
Current accumulated deferred income tax (asset) liability | (940,650) | (877,393)
Public Service Company of New Mexico [Member] |  |
Deferred tax assets: |  |
Net operating loss | 117,922 | 116,693
Regulatory liabilities related to income taxes | 60,940 | 75,889
Federal tax credit carryforwards | 59,156 | 57,928
Shutdown of SJGS Units 2 and 3 | 53,434 | 53,823
Other | 41,700 | 41,210
Total deferred tax assets | 333,152 | 345,543
Deferred tax liabilities: |  |
Depreciation and plant related | (891,578) | (828,926)
Investment tax credit | (56,017) | (56,589)
Regulatory assets related to income taxes | (56,577) | (61,018)
Pension | (50,134) | (58,070)
Other | (27,512) | (37,324)
Total deferred tax liabilities | (1,081,818) | (1,041,927)
Current accumulated deferred income tax (asset) liability | (748,666) | (696,384)
Texas-New Mexico Power Company [Member] |  |
Deferred tax assets: |  |
Regulatory liabilities related to income taxes | 3,718 | 4,141
Other | 6,016 | 6,702
Total deferred tax assets | 9,734 | 10,843
Deferred tax liabilities: |  |
Depreciation and plant related | (201,017) | (189,322)
Regulatory assets related to income taxes | (9,800) | (10,036)
Loss on reacquired debt | (11,937) | (12,392)
CTC | (12,715) | (16,151)
Other | (20,050) | (15,733)
Total deferred tax liabilities | (255,519) | (243,634)
Current accumulated deferred income tax (asset) liability | $ (245,785) | $ (232,791)

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