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Schedule I - Condensed Financial Information of Parent Company (Statement of Cash flow) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash Flows From Operating Activities: |  |  |
Net earnings (loss) | $ 100,507 | $ 105,547 | $ 176,359
Depreciation and amortization | 208,173 | 206,499 | 195,366
Deferred income tax expense | 60,430 | 56,243 | 124,424
(Gain) on reacquired debt | 3,253 | 0 | 9,209
Stock based compensation expense | 5,320 | 3,585 | 6,556
Changes in certain assets and liabilities: |  |  |
Other current assets | 8,577 | (2,598) | (21,979)
Other assets | (12,801) | (30,778) | (15,835)
Accounts payable | 4,484 | 14,020 | 20,969
Accrued interest and taxes | 91,537 | 255 | 7,304
Other current liabilities | (19,648) | (19,905) | 3,460
Other liabilities | (61,262) | (70,743) | (6,735)
Net cash flows from operating activities | 386,587 | 281,349 | 292,240
Cash Flows From Investing Activities: |  |  |
Utility plant additions | (348,039) | (308,909) | (326,931)
Other, net | 4,096 | 4,943 | (17)
Net cash flows from investing activities | (331,446) | (285,895) | 19,778
Cash Flows From Financing Activities: |  |  |
Short-term borrowings (repayments), net | (9,500) | (24,000) | (139,300)
Repayment of long-term debt | (29,468) | (22,387) | (110,752)
Purchase of preferred stock | 0 | 0 | (73,475)
Purchase of common stock | 0 | 0 | (125,683)
Proceeds from stock option exercise | 4,618 | 11,684 | 5,622
Purchases to satisfy awards of common stock | (13,807) | (25,168) | (10,104)
Dividends paid | (51,508) | (45,137) | (45,656)
Net cash flows from financing activities | (61,593) | (1,560) | (312,331)
Change in Cash and Cash Equivalents | (6,452) | (6,106) | (313)
Cash and Cash Equivalents at Beginning of Year | 8,985 | 15,091 | 15,404
Cash and Cash Equivalents at End of Year | 2,533 | 8,985 | 15,091
Supplemental Cash Flow Disclosures: |  |  |
Interest paid | 99,382 | 113,265 | 116,391
Income taxes paid (refunded), net | (95,327) | 5,302 | (5,527)
PNM Resources [Member] |  |  |
Cash Flows From Operating Activities: |  |  |
Net earnings (loss) | 100,507 | 105,547 | 176,359
Depreciation and amortization | 4,192 | 5,000 | 7,654
Deferred income tax expense | (51,820) | (46,632) | (34,396)
Equity in (earnings) loss of subsidiaries | (116,634) | (117,900) | (205,215)
(Gain) on reacquired debt | 3,253 | 0 | 9,209
Stock based compensation expense | 5,320 | 3,585 | 6,556
Changes in certain assets and liabilities: |  |  |
Other current assets | 28,460 | (43,638) | 42,687
Other assets | 46,558 | 34,096 | 59,975
Accounts payable | 620 | 8 | (1)
Accrued interest and taxes | (9,266) | (28,855) | 27,348
Other current liabilities | (146) | 3,876 | 4,765
Other liabilities | (27,756) | (29,601) | (12,854)
Net cash flows from operating activities | (16,712) | (114,514) | 82,087
Cash Flows From Investing Activities: |  |  |
Utility plant additions | (960) | (7,524) | 0
Investments in subsidiaries | (13,800) | 0 | (43,000)
Investments in Optim Energy | 0 | 0 | 0
Cash dividends from subsidiaries | 158,772 | 61,406 | 285,757
Net cash flows from investing activities | 144,012 | 53,882 | 242,757
Cash Flows From Financing Activities: |  |  |
Short-term borrowings (repayments), net | (37,600) | 120,900 | (15,300)
Short-term borrowings (repayments) – affiliate, net | 0 | 0 | 300
Repayment of long-term debt | (29,468) | (2,387) | (60,391)
Purchase of preferred stock | 0 | 0 | (73,475)
Purchase of common stock | 0 | 0 | (125,683)
Proceeds from stock option exercise | 4,618 | 11,684 | 5,622
Purchases to satisfy awards of common stock | (13,807) | (25,168) | (10,104)
Excess tax (shortfall) from stock-based payment arrangements | 0 | 0 | 0
Dividends paid | (50,980) | (44,609) | (45,128)
Other, net | 0 | 0 | (747)
Net cash flows from financing activities | (127,237) | 60,420 | (324,906)
Change in Cash and Cash Equivalents | 63 | (212) | (62)
Cash and Cash Equivalents at Beginning of Year | 29 | 241 | 303
Cash and Cash Equivalents at End of Year | 92 | 29 | 241
Supplemental Cash Flow Disclosures: |  |  |
Interest paid | 14,510 | 15,007 | 19,215
Income taxes paid (refunded), net | $ 22,378 | $ 1,501 | $ 5,454

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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