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Schedule I - Condensed Financial Information of Parent Company (Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 46,051 | $ 28,274 | $ 2,533 | $ 8,985
Income taxes receivable | 5,845 | 6,360 |  |
Other, net | 82,104 | 58,471 |  |
Total current assets | 385,570 | 406,434 |  |
Property, plant and equipment, net of accumulated depreciation of $11,276 and $10,251 | 4,535,372 | 4,270,006 |  |
Other long-term assets | 604 | 1,762 |  |
Total assets | 6,009,328 | 5,790,237 | 5,426,858 |
Liabilities and Stockholders’ Equity |  |  |  |
Short-term debt | 250,600 | 105,600 |  |
Current maturities of long-term debt | 124,979 | 332,871 |  |
Accrued interest and taxes | 58,306 | 53,863 |  |
Other current liabilities | 59,494 | 70,194 |  |
Total current liabilities | 641,120 | 704,087 |  |
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs | 1,966,969 | 1,629,514 |  |
Total liabilities | 4,271,579 | 3,983,616 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,166,465 | 1,173,845 |  |
Accumulated other comprehensive income (loss), net of tax | (71,432) | (61,755) | (58,140) | (81,630)
Retained earnings | 559,780 | 609,456 |  |
Total PNMR common stockholders’ equity | 1,654,813 | 1,721,546 |  |
Total liabilities and stockholders' equity | 6,009,328 | 5,790,237 |  |
PNM Resources [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 441 | 382 | $ 92 | $ 29
Intercompany receivables | 102,676 | 107,619 |  |
Income taxes receivable | 0 | 29 |  |
Other, net | 524 | 548 |  |
Total current assets | 103,641 | 108,578 |  |
Property, plant and equipment, net of accumulated depreciation of $11,276 and $10,251 | 26,707 | 27,076 |  |
Investment in subsidiaries | 1,822,593 | 1,757,650 |  |
Other long-term assets | 81,168 | 78,347 |  |
Total long-term assets | 1,930,468 | 1,863,073 |  |
Total assets | 2,034,109 | 1,971,651 |  |
Liabilities and Stockholders’ Equity |  |  |  |
Short-term debt | 191,600 | 100,600 |  |
Short-term debt-affiliate | 8,819 | 8,819 |  |
Current maturities of long-term debt | 0 | 118,607 |  |
Accrued interest and taxes | 7,780 | 2,816 |  |
Other current liabilities | 18,282 | 16,320 |  |
Total current liabilities | 226,481 | 247,162 |  |
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs | 149,860 | 0 |  |
Other long-term liabilities | 2,955 | 2,943 |  |
Total liabilities | 379,296 | 250,105 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,166,465 | 1,173,845 |  |
Accumulated other comprehensive income (loss), net of tax | (71,432) | (61,755) |  |
Retained earnings | 559,780 | 609,456 |  |
Total PNMR common stockholders’ equity | 1,654,813 | 1,721,546 |  |
Total liabilities and stockholders' equity | $ 2,034,109 | $ 1,971,651 |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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