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Earnings and Dividends Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | $ 85,642 | $ 79,874 | $ 116,849
Average Number of Common Shares: |  |  |  |  |  |  |  |  |  |  |
Outstanding during year (in shares) |  |  |  |  |  |  |  |  | 79,654 | 79,654 | 79,654
Vested awards of restricted stock (in shares) |  |  |  |  |  |  |  |  | 236 | 237 | 104
Average Shares – Basic (in shares) |  |  |  |  |  |  |  |  | 79,890 | 79,891 | 79,758
Dilutive Effect of Common Stock Equivalents: |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock (in shares) |  |  |  |  |  |  |  |  | 122 | 250 | 374
Average Shares – Diluted (in shares) |  |  |  |  |  |  |  |  | 80,012 | 80,141 | 80,132
Net Earnings Attributable to PNMR Per Share of Common Stock: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.70) | $ 1.10 | $ 0.48 | $ 0.19 | $ (0.68) | $ 0.92 | $ 0.47 | $ 0.29 | $ 1.07 | $ 1.00 | $ 1.47
Diluted (in dollars per share) | $ (0.69) | $ 1.09 | $ 0.48 | $ 0.19 | $ (0.68) | $ 0.92 | $ 0.47 | $ 0.29 | 1.07 | 1.00 | 1.46
Dividends Declared per Common Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.0850 | $ 0.9925 | $ 0.9025

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=109256448&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1252-109256 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256 + Details
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