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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 1,675,952 |  |
Amounts reclassified from AOCI (pre-tax) | (10,534) | $ (15,871) | $ (22,579)
Income tax impact of amounts reclassified | 4,087 | 6,193 | 8,849
Other OCI changes (pre-tax) | 32,778 | (18,597) | 6,665
Income tax impact of other OCI changes | (12,234) | 7,256 | (2,612)
Total Other Comprehensive Income (Loss) | 14,097 | (21,019) | (9,677)
Reclassification of stranded income taxes to retained earnings | (17,586) |  |
Ending Balance | 1,695,253 | 1,675,952 |
Public Service Company of New Mexico |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 1,397,872 |  |
Amounts reclassified from AOCI (pre-tax) | (11,115) | (16,635) | (22,579)
Income tax impact of amounts reclassified | 4,312 | 6,491 | 8,849
Other OCI changes (pre-tax) | 31,778 | (17,723) | 6,593
Income tax impact of other OCI changes | (11,846) | 6,915 | (2,584)
Total Other Comprehensive Income (Loss) | 13,129 | (20,952) | (9,721)
Reclassification of stranded income taxes to retained earnings | (17,794) |  |
Ending Balance | 1,422,174 | 1,397,872 |
AOCI |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (92,451) | (71,432) | (61,755)
Total Other Comprehensive Income (Loss) | 14,097 | (21,019) | (9,677)
Reclassification of stranded income taxes to retained earnings | (17,586) |  |
Ending Balance | (95,940) | (92,451) | (71,432)
AOCI | Public Service Company of New Mexico |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (92,428) | (71,476) | (61,755)
Total Other Comprehensive Income (Loss) | 13,129 | (20,952) | (9,721)
Reclassification of stranded income taxes to retained earnings | (17,794) |  |
Ending Balance | (97,093) | (92,428) | (71,476)
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 4,320 | 17,346 | 28,008
Amounts reclassified from AOCI (pre-tax) | (17,567) | (22,139) | (28,531)
Income tax impact of amounts reclassified | 6,816 | 8,639 | 11,181
Other OCI changes (pre-tax) | 28,160 | 778 | 10,998
Income tax impact of other OCI changes | (10,927) | (304) | (4,310)
Total Other Comprehensive Income (Loss) | 6,482 | (13,026) | (10,662)
Reclassification of stranded income taxes to retained earnings | 2,367 |  |
Ending Balance | 13,169 | 4,320 | 17,346
Pension Liability Adjustment | Public Service Company of New Mexico |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (96,748) | (88,822) | (89,763)
Amounts reclassified from AOCI (pre-tax) | 6,452 | 5,504 | 5,952
Income tax impact of amounts reclassified | (2,504) | (2,148) | (2,332)
Other OCI changes (pre-tax) | 3,618 | (18,501) | (4,405)
Income tax impact of other OCI changes | (919) | 7,219 | 1,726
Total Other Comprehensive Income (Loss) | 6,647 | (7,926) | 941
Reclassification of stranded income taxes to retained earnings | (20,161) |  |
Ending Balance | (110,262) | (96,748) | (88,822)
Fair Value Adjustment for Cash Flow Hedges |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (23) | 44 | 0
Amounts reclassified from AOCI (pre-tax) | 581 | 764 | 0
Income tax impact of amounts reclassified | (225) | (298) | 0
Other OCI changes (pre-tax) | 1,000 | (874) | 72
Income tax impact of other OCI changes | (388) | 341 | (28)
Total Other Comprehensive Income (Loss) | 968 | (67) | 44
Reclassification of stranded income taxes to retained earnings | 208 |  |
Ending Balance | $ 1,153 | $ (23) | $ 44

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