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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding AOCI is as follows:
| Accumulated Other Comprehensive Income (Loss)
| PNM |  | PNMR
| Unrealized Gains on Available-for-Sale Securities |  | Pension Liability Adjustment |  | Total |  | Fair Value Adjustment for Cash Flow Hedges |  | Total
| (In thousands)
Balance at December 31, 2014 | $ | 28,008 |  |  | $ | (89,763 | ) |  | $ | (61,755 | ) |  | $ | — |  |  | $ | (61,755 | )
Amounts reclassified from AOCI (pre-tax) | (28,531 | ) |  | 5,952 |  |  | (22,579 | ) |  | — |  |  | (22,579 | )
Income tax impact of amounts reclassified | 11,181 |  |  | (2,332 | ) |  | 8,849 |  |  | — |  |  | 8,849 |
Other OCI changes (pre-tax) | 10,998 |  |  | (4,405 | ) |  | 6,593 |  |  | 72 |  |  | 6,665 |
Income tax impact of other OCI changes | (4,310 | ) |  | 1,726 |  |  | (2,584 | ) |  | (28 | ) |  | (2,612 | )
Net after-tax change | (10,662 | ) |  | 941 |  |  | (9,721 | ) |  | 44 |  |  | (9,677 | )
Balance at December 31, 2015 | 17,346 |  |  | (88,822 | ) |  | (71,476 | ) |  | 44 |  |  | (71,432 | )
Amounts reclassified from AOCI (pre-tax) | (22,139 | ) |  | 5,504 |  |  | (16,635 | ) |  | 764 |  |  | (15,871 | )
Income tax impact of amounts reclassified | 8,639 |  |  | (2,148 | ) |  | 6,491 |  |  | (298 | ) |  | 6,193 |
Other OCI changes (pre-tax) | 778 |  |  | (18,501 | ) |  | (17,723 | ) |  | (874 | ) |  | (18,597 | )
Income tax impact of other OCI changes | (304 | ) |  | 7,219 |  |  | 6,915 |  |  | 341 |  |  | 7,256 |
Net after-tax change | (13,026 | ) |  | (7,926 | ) |  | (20,952 | ) |  | (67 | ) |  | (21,019 | )
Balance at December 31, 2016 | 4,320 |  |  | (96,748 | ) |  | (92,428 | ) |  | (23 | ) |  | (92,451 | )
Amounts reclassified from AOCI (pre-tax) | (17,567 | ) |  | 6,452 |  |  | (11,115 | ) |  | 581 |  |  | (10,534 | )
Income tax impact of amounts reclassified | 6,816 |  |  | (2,504 | ) |  | 4,312 |  |  | (225 | ) |  | 4,087 |
Other OCI changes (pre-tax) | 28,160 |  |  | 3,618 |  |  | 31,778 |  |  | 1,000 |  |  | 32,778 |
Income tax impact of other OCI changes | (10,927 | ) |  | (919 | ) |  | (11,846 | ) |  | (388 | ) |  | (12,234 | )
Net after-tax change | 6,482 |  |  | 6,647 |  |  | 13,129 |  |  | 968 |  |  | 14,097 |
Reclassification of stranded income taxes to retained earnings Note 11 | 2,367 |  |  | (20,161 | ) |  | (17,794 | ) |  | 208 |  |  | (17,586 | )
Balance at December 31, 2017 | $ | 13,169 |  |  | $ | (110,262 | ) |  | $ | (97,093 | ) |  | $ | 1,153 |  |  | $ | (95,940 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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