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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 1,654,813 |  |
Amounts reclassified from AOCI (pre-tax) | (15,871) | $ (22,579) | $ (8,152)
Income tax impact of amounts reclassified | 6,193 | 8,849 | 3,234
Other OCI changes (pre-tax) | (18,597) | 6,665 | 2,038
Income tax impact of other OCI changes | 7,256 | (2,612) | (735)
Total Other Comprehensive Income (Loss) | (21,019) | (9,677) | $ (3,615)
Ending Balance | $ 1,675,952 | $ 1,654,813 |
Percentage of pension liability adjustment capitalized into construction work in process | 23.40% | 22.20% | 24.40%
Percentage of pension liability adjustment capitalized into other accounts | 2.40% | 2.40% | 2.00%
Public Service Company of New Mexico [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 1,317,933 |  |
Amounts reclassified from AOCI (pre-tax) | (16,635) | $ (22,579) | $ (8,710)
Income tax impact of amounts reclassified | 6,491 | 8,849 | 3,429
Other OCI changes (pre-tax) | (17,723) | 6,593 | 2,191
Income tax impact of other OCI changes | 6,915 | (2,584) | (788)
Total Other Comprehensive Income (Loss) | (20,952) | (9,721) | (3,878)
Ending Balance | 1,397,872 | 1,317,933 |
Texas-New Mexico Power Company [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 533,380 | 524,665 | 502,931
Total Other Comprehensive Income (Loss) | 0 | 0 | 263
Ending Balance | 593,235 | 533,380 | 524,665
Unrealized Gain on Available-for-Sale Securities [Member] | Public Service Company of New Mexico [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 17,346 | 28,008 | 25,748
Amounts reclassified from AOCI (pre-tax) | (22,139) | (28,531) | (13,862)
Income tax impact of amounts reclassified | 8,639 | 11,181 | 5,461
Other OCI changes (pre-tax) | 778 | 10,998 | 17,473
Income tax impact of other OCI changes | (304) | (4,310) | (6,812)
Total Other Comprehensive Income (Loss) | (13,026) | (10,662) | 2,260
Ending Balance | 4,320 | 17,346 | 28,008
Pension Liability Adjustment [Member] | Public Service Company of New Mexico [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (88,822) | (89,763) | (83,625)
Amounts reclassified from AOCI (pre-tax) | 5,504 | 5,952 | 5,152
Income tax impact of amounts reclassified | (2,148) | (2,332) | (2,032)
Other OCI changes (pre-tax) | (18,501) | (4,405) | (15,282)
Income tax impact of other OCI changes | 7,219 | 1,726 | 6,024
Total Other Comprehensive Income (Loss) | (7,926) | 941 | (6,138)
Ending Balance | (96,748) | (88,822) | (89,763)
Fair Value Adjustment for Cash Flow Hedges [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 44 | 0 | 0
Amounts reclassified from AOCI (pre-tax) | 764 | 0 | 0
Income tax impact of amounts reclassified | (298) | 0 | 0
Other OCI changes (pre-tax) | (874) | 72 | 0
Income tax impact of other OCI changes | 341 | (28) | 0
Total Other Comprehensive Income (Loss) | (67) | 44 | 0
Ending Balance | (23) | 44 | 0
Fair Value Adjustment for Cash Flow Hedges [Member] | Texas-New Mexico Power Company [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | (263)
Amounts reclassified from AOCI (pre-tax) | 0 | 0 | 558
Income tax impact of amounts reclassified | 0 | 0 | (195)
Other OCI changes (pre-tax) | 0 | 0 | (153)
Income tax impact of other OCI changes | 0 | 0 | 53
Total Other Comprehensive Income (Loss) | 0 | 0 | 263
Ending Balance | 0 | 0 | 0
Total [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (71,432) | (61,755) | (58,140)
Total Other Comprehensive Income (Loss) | (21,019) | (9,677) | (3,615)
Ending Balance | (92,451) | (71,432) | (61,755)
Total [Member] | Public Service Company of New Mexico [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (71,476) | (61,755) | (57,877)
Total Other Comprehensive Income (Loss) | (20,952) | (9,721) | (3,878)
Ending Balance | $ (92,428) | $ (71,476) | (61,755)
Total [Member] | Texas-New Mexico Power Company [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance |  |  | (263)
Total Other Comprehensive Income (Loss) |  |  | $ 263

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