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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | $ 1,761,448 |  |
Cumulative effect adjustment (Note 7) |  |  | $ (11,208)
Balance, as adjusted |  |  | 1,761,448
Amounts reclassified from AOCI (pre-tax) | (791) | $ (1,033) |
Income tax impact of amounts reclassified | 201 | 403 |
Other OCI changes (pre-tax) | 2,973 | 7,581 |
Income tax impact of other OCI changes | (755) | (2,958) |
Total Other Comprehensive Income | 1,628 | 3,993 |
Ending balance | 1,749,014 | (88,458) |
Total |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (95,940) | (92,451) |
Balance, as adjusted |  |  | (107,148)
Ending balance | (105,520) |  |
Fair Value Adjustment for Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | 1,153 | (23) |
Cumulative effect adjustment (Note 7) |  |  | 0
Balance, as adjusted |  |  | 1,153
Amounts reclassified from AOCI (pre-tax) | (53) | 112 |
Income tax impact of amounts reclassified | 13 | (44) |
Other OCI changes (pre-tax) | 1,858 | (185) |
Income tax impact of other OCI changes | (472) | 72 |
Total Other Comprehensive Income | 1,346 | (45) |
Ending balance | 2,499 | (68) |
PNM |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | 1,488,369 |  |
Cumulative effect adjustment (Note 7) |  |  | (11,208)
Balance, as adjusted |  |  | 1,488,369
Amounts reclassified from AOCI (pre-tax) | (738) | (1,145) |
Income tax impact of amounts reclassified | 188 | 447 |
Other OCI changes (pre-tax) | 1,115 | 7,766 |
Income tax impact of other OCI changes | (283) | (3,030) |
Total Other Comprehensive Income | 282 | 4,038 |
Ending balance | 1,495,561 |  |
PNM | Total |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (97,093) | (92,428) |
Balance, as adjusted |  |  | (108,301)
Ending balance | (108,019) | (88,390) |
PNM | Unrealized Gains on Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | 13,169 | 4,320 |
Cumulative effect adjustment (Note 7) |  |  | (11,208)
Balance, as adjusted |  |  | 1,961
Amounts reclassified from AOCI (pre-tax) | (2,629) | (2,763) |
Income tax impact of amounts reclassified | 668 | 1,078 |
Other OCI changes (pre-tax) | 1,115 | 7,766 |
Income tax impact of other OCI changes | (283) | (3,030) |
Total Other Comprehensive Income | (1,129) | 3,051 |
Ending balance | 832 | 7,371 |
PNM | Pension Liability Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (110,262) | (96,748) |
Cumulative effect adjustment (Note 7) |  |  | 0
Balance, as adjusted |  |  | $ (110,262)
Amounts reclassified from AOCI (pre-tax) | 1,891 | 1,618 |
Income tax impact of amounts reclassified | (480) | (631) |
Total Other Comprehensive Income | 1,411 | 987 |
Ending balance | $ (108,851) | $ (95,761) |

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