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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Electric Domestic Regulated Revenue |  |  |  |  |  |  |  |  |  |  | $ 1,700,619
Revenue from Related Parties |  |  |  |  |  |  |  |  |  |  | 0
Electric Operating Revenues | 322,929 | 399,730 | 347,599 | 317,665 | 322,758 | 390,411 | 323,860 | 305,374 | 1,387,923 | 1,342,403 | 1,700,619
Cost of energy |  |  |  |  |  |  |  |  | 432,316 | 399,850 | 692,922
Gross margin |  |  |  |  |  |  |  |  | 955,607 | 942,553 | 1,007,697
Other operating expenses |  |  |  |  |  |  |  |  | 501,884 | 504,659 | 593,351
Depreciation and amortization |  |  |  |  |  |  |  |  | 166,881 | 164,173 | 157,047
Operating income | 40,532 | 117,739 | 77,867 | 50,704 | 36,736 | 118,150 | 65,106 | 53,729 | 286,842 | 273,721 | 257,299
Interest income |  |  |  |  |  |  |  |  | 10,043 | 13,072 | 15,515
Gain on sale of First Choice |  |  |  |  |  |  |  |  | 0 | 1,012 | 174,925
Other income (deductions) |  |  |  |  |  |  |  |  | (368) | 8,075 | (10,421)
Net interest charges |  |  |  |  |  |  |  |  | (121,448) | (120,845) | (124,849)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 175,069 | 175,035 | 312,469
Income Taxes |  |  |  |  |  |  |  |  | 59,513 | 54,910 | 121,535
Net earnings | 11,397 | 58,814 | 31,383 | 13,962 | 12,573 | 61,976 | 25,099 | 20,477 | 115,556 | 120,125 | 190,934
Earnings (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  | 190,934
Valencia non-controlling interest |  |  |  |  |  |  |  |  | (14,521) | (14,050) | (14,047)
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Segment earnings (loss) from continuing operations attributable to PNMR (excluding discontinued operations amounts related to sale of PNM Gas) |  |  |  |  |  |  |  |  |  |  | 176,359
Earnings Attributable to PNMR | 7,648 | 54,555 | 27,678 | 10,626 | 9,091 | 57,864 | 21,512 | 17,080 | 100,507 | 105,547 | 176,359
Gross property additions |  |  |  |  |  |  |  |  | 348,039 | 308,909 | 326,931
Gross property additions |  |  |  |  |  |  |  |  |  |  | 326,931
Total Assets | 5,500,210 |  |  |  | 5,372,583 |  |  |  | 5,500,210 | 5,372,583 | 5,204,613
Goodwill | 278,297 |  |  |  | 278,297 |  |  |  | 278,297 | 278,297 | 278,297
PNM [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Electric Domestic Regulated Revenue |  |  |  |  |  |  |  |  |  |  | 1,057,289
Revenue from Related Parties |  |  |  |  |  |  |  |  |  |  | 0
Electric Operating Revenues |  |  |  |  |  |  |  |  | 1,116,312 | 1,092,264 | 1,057,289
Cost of energy |  |  |  |  |  |  |  |  | 374,710 | 353,649 | 362,237
Gross margin |  |  |  |  |  |  |  |  | 741,602 | 738,615 | 695,052
Other operating expenses |  |  |  |  |  |  |  |  | 428,591 | 435,442 | 438,822
Depreciation and amortization |  |  |  |  |  |  |  |  | 103,826 | 97,291 | 94,787
Operating income |  |  |  |  |  |  |  |  | 209,185 | 205,882 | 161,443
Interest income |  |  |  |  |  |  |  |  | 10,182 | 13,243 | 15,562
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  | 0 | 0
Other income (deductions) |  |  |  |  |  |  |  |  | 11,288 | 13,290 | 4,309
Net interest charges |  |  |  |  |  |  |  |  | (79,175) | (76,101) | (75,349)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 151,480 | 156,314 | 105,965
Income Taxes |  |  |  |  |  |  |  |  | 48,804 | 50,713 | 37,427
Net earnings |  |  |  |  |  |  |  |  | 102,676 | 105,601 |
Earnings (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  | 68,538
Valencia non-controlling interest |  |  |  |  |  |  |  |  | (14,521) | (14,050) | (14,047)
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Segment earnings (loss) from continuing operations attributable to PNMR (excluding discontinued operations amounts related to sale of PNM Gas) |  |  |  |  |  |  |  |  |  |  | 53,963
Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | 87,627 | 91,023 |
Gross property additions |  |  |  |  |  |  |  |  | 239,906 | 196,800 |
Gross property additions |  |  |  |  |  |  |  |  |  |  | 251,345
Total Assets | 4,227,616 |  |  |  | 4,163,907 |  |  |  | 4,227,616 | 4,163,907 | 4,095,287
Goodwill | 51,632 |  |  |  | 51,632 |  |  |  | 51,632 | 51,632 | 51,632
TNMP [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Electric Domestic Regulated Revenue |  |  |  |  |  |  |  |  |  |  | 204,045
Revenue from Related Parties |  |  |  |  |  |  |  |  |  |  | 33,813
Electric Operating Revenues |  |  |  |  |  |  |  |  | 271,611 | 250,140 | 237,858
Cost of energy |  |  |  |  |  |  |  |  | 57,606 | 46,201 | 41,166
Gross margin |  |  |  |  |  |  |  |  | 214,005 | 203,939 | 196,692
Other operating expenses |  |  |  |  |  |  |  |  | 91,601 | 87,079 | 88,234
Depreciation and amortization |  |  |  |  |  |  |  |  | 50,219 | 49,340 | 44,616
Operating income |  |  |  |  |  |  |  |  | 72,185 | 67,520 | 63,842
Interest income |  |  |  |  |  |  |  |  | 0 | 1 | 2
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  | 0 | 0
Other income (deductions) |  |  |  |  |  |  |  |  | 1,919 | 2,739 | 1,580
Net interest charges |  |  |  |  |  |  |  |  | (27,393) | (28,161) | (29,286)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 46,711 | 42,099 | 36,138
Income Taxes |  |  |  |  |  |  |  |  | 17,621 | 15,352 | 13,881
Valencia non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | 29,090 | 26,747 | 22,257
Gross property additions |  |  |  |  |  |  |  |  | 89,117 | 92,973 |
Gross property additions |  |  |  |  |  |  |  |  |  |  | 67,407
Total Assets | 1,162,431 |  |  |  | 1,086,229 |  |  |  | 1,162,431 | 1,086,229 | 1,037,445
Goodwill | 226,665 |  |  |  | 226,665 |  |  |  | 226,665 | 226,665 | 226,665
First Choice [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Electric Domestic Regulated Revenue |  |  |  |  |  |  |  |  |  |  | 439,450
Revenue from Related Parties |  |  |  |  |  |  |  |  |  |  | 0
Electric Operating Revenues |  |  |  |  |  |  |  |  |  |  | 439,450
Cost of energy |  |  |  |  |  |  |  |  |  |  | 323,331
Gross margin |  |  |  |  |  |  |  |  |  |  | 116,119
Other operating expenses |  |  |  |  |  |  |  |  |  |  | 75,966
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 1,098
Operating income |  |  |  |  |  |  |  |  |  |  | 39,055
Interest income |  |  |  |  |  |  |  |  |  |  | 64
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  |  | 0
Other income (deductions) |  |  |  |  |  |  |  |  |  |  | (650)
Net interest charges |  |  |  |  |  |  |  |  |  |  | (581)
Earnings before Income Taxes |  |  |  |  |  |  |  |  |  |  | 37,888
Income Taxes |  |  |  |  |  |  |  |  |  |  | 13,772
Valencia non-controlling interest |  |  |  |  |  |  |  |  |  |  | 0
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  |  |  | 0
Earnings Attributable to PNMR |  |  |  |  |  |  |  |  |  |  | 24,116
Gross property additions |  |  |  |  |  |  |  |  |  |  | 2,089
Total Assets |  |  |  |  |  |  |  |  |  |  | 0
Goodwill |  |  |  |  |  |  |  |  |  |  | 0
Significant Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Electric Domestic Regulated Revenue |  |  |  |  |  |  |  |  |  |  | (165)
Revenue from Related Parties |  |  |  |  |  |  |  |  |  |  | (33,813)
Electric Operating Revenues |  |  |  |  |  |  |  |  | 0 | (1) | (33,978)
Cost of energy |  |  |  |  |  |  |  |  | 0 | 0 | (33,812)
Gross margin |  |  |  |  |  |  |  |  | 0 | (1) | (166)
Other operating expenses |  |  |  |  |  |  |  |  | (18,308) | (17,862) | (9,671)
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,836 | 17,542 | 16,546
Operating income |  |  |  |  |  |  |  |  | 5,472 | 319 | (7,041)
Interest income |  |  |  |  |  |  |  |  | (139) | (172) | (113)
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  | 1,012 | 174,925
Other income (deductions) |  |  |  |  |  |  |  |  | (13,575) | (7,954) | (15,660)
Net interest charges |  |  |  |  |  |  |  |  | (14,880) | (16,583) | (19,633)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | (23,122) | (23,378) | 132,478
Income Taxes |  |  |  |  |  |  |  |  | (6,912) | (11,155) | 56,455
Valencia non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | (16,210) | (12,223) | 76,023
Gross property additions |  |  |  |  |  |  |  |  | 19,016 | 19,136 |
Gross property additions |  |  |  |  |  |  |  |  |  |  | 6,090
Total Assets | 110,163 |  |  |  | 122,447 |  |  |  | 110,163 | 122,447 | 71,881
Goodwill | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0

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