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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating loss | $ 82,386 | $ 98,301
Regulatory liabilities related to income taxes | 158,416 | 189,501
Federal tax credit carryforwards | 76,481 | 71,849
Shutdown of SJGS Units 2 and 3 | 1,638 | 2,204
Other | 97,515 | 45,656
Total deferred tax assets | 416,436 | 407,511
Deferred tax liabilities: |  |
Depreciation and plant related | (767,482) | (690,909)
Investment tax credit | (57,853) | (55,731)
Regulatory assets related to income taxes | (62,889) | (61,956)
CTC | (3,613) | (5,670)
Pension | (35,407) | (56,070)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (30,425) | (31,887)
Other | (59,486) | (52,498)
Total deferred tax liabilities | (1,017,155) | (954,721)
Net accumulated deferred income tax liabilities | (600,719) | (547,210)
Public Service Company of New Mexico |  |
Deferred tax assets: |  |
Net operating loss | 50,762 | 67,719
Regulatory liabilities related to income taxes | 125,395 | 152,059
Federal tax credit carryforwards | 62,230 | 60,085
Shutdown of SJGS Units 2 and 3 | 1,638 | 2,204
Other | 36,916 | 23,801
Total deferred tax assets | 276,941 | 305,868
Deferred tax liabilities: |  |
Depreciation and plant related | (606,673) | (544,270)
Investment tax credit | (55,484) | (55,731)
Regulatory assets related to income taxes | (53,561) | (52,392)
Pension | (31,046) | (51,774)
Regulatory asset for shutdown of SJGS Units 2 and 3 | (30,425) | (31,887)
Other | (2,519) | (18,826)
Total deferred tax liabilities | (779,708) | (754,880)
Net accumulated deferred income tax liabilities | (502,767) | (449,012)
Texas-New Mexico Power Company |  |
Deferred tax assets: |  |
Regulatory liabilities related to income taxes | 33,021 | 43,103
Other | 4,517 | 3,762
Total deferred tax assets | 37,538 | 46,865
Deferred tax liabilities: |  |
Depreciation and plant related | (136,117) | (135,647)
Regulatory assets related to income taxes | (9,328) | (9,564)
Loss on reacquired debt | (6,617) | (6,890)
CTC | (3,613) | (5,670)
Pension | (4,361) | (4,296)
AMS | (10,030) | (7,707)
Other | (3,710) | (3,506)
Total deferred tax liabilities | (173,776) | (173,280)
Net accumulated deferred income tax liabilities | $ (136,238) | $ (126,415)

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