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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss | $ 98,301 | $ 160,901
Regulatory liabilities related to income taxes | 189,501 | 64,657
Federal tax credit carryforwards | 71,849 | 78,675
Shutdown of SJGS Units 2 and 3 | 2,204 | 53,434
Other | 45,656 | 75,805
Total deferred tax assets | 407,511 | 433,472
Deferred tax liabilities: |  |
Depreciation and plant related | (690,909) | (1,102,458)
Investment tax credit | (55,731) | (56,017)
Regulatory assets related to income taxes | (61,956) | (66,378)
CTC | (5,670) | (12,715)
Pension | (56,070) | (57,287)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (31,887) | 0
Other | (52,498) | (79,267)
Total deferred tax liabilities | (954,721) | (1,374,122)
Net accumulated deferred income tax liabilities | (547,210) | (940,650)
Public Service Company of New Mexico |  |
Deferred tax assets: |  |
Net operating loss | 67,719 | 117,922
Regulatory liabilities related to income taxes | 152,059 | 60,940
Federal tax credit carryforwards | 60,085 | 59,156
Shutdown of SJGS Units 2 and 3 | 2,204 | 53,434
Other | 23,801 | 41,700
Total deferred tax assets | 305,868 | 333,152
Deferred tax liabilities: |  |
Depreciation and plant related | (544,270) | (891,578)
Investment tax credit | (55,731) | (56,017)
Regulatory assets related to income taxes | (52,392) | (56,577)
Pension | (51,774) | (50,134)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (31,887) | 0
Other | (18,826) | (27,512)
Total deferred tax liabilities | (754,880) | (1,081,818)
Net accumulated deferred income tax liabilities | (449,012) | (748,666)
Texas-New Mexico Power Company |  |
Deferred tax assets: |  |
Regulatory liabilities related to income taxes | 43,103 | 3,718
Other | 3,762 | 6,016
Total deferred tax assets | 46,865 | 9,734
Deferred tax liabilities: |  |
Depreciation and plant related | (135,647) | (201,017)
Regulatory assets related to income taxes | (9,564) | (9,800)
Loss on reacquired debt | (6,890) | (11,937)
CTC | (5,670) | (12,715)
Pension | (4,296) | (7,153)
AMS | (7,707) | (8,928)
Other | (3,506) | (3,969)
Total deferred tax liabilities | (173,280) | (255,519)
Net accumulated deferred income tax liabilities | $ (126,415) | $ (245,785)

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