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Schedule I - Condensed Financial Information of Parent Company - Statement of Cash flow (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Flows From Operating Activities: |  |  |
Net Cash Flows From Operating Activities | $ 524,462 | $ 415,454 | $ 386,874
Cash Flows From Investing Activities: |  |  |
Net cash flows from investing activities | (466,163) | (699,375) | (544,528)
Cash Flows From Financing Activities: |  |  |
Short-term loan |  | 100,000 | 50,000
Repayment of short-term loan | 0 | (150,000) | 0
Revolving credit facility borrowings (repayments), net | 18,300 | 86,500 | 95,000
Long-term borrowings | 317,000 | 603,500 | 463,605
Repayment of long-term debt | (274,070) | (303,793) | (333,066)
Proceeds from stock option exercise | 1,739 | 7,028 | 5,619
Dividends paid | (77,792) | (70,623) | (64,251)
Other, net | (2,942) | (2,104) | (4,396)
Net cash flows from financing activities | (58,847) | 242,392 | 175,431
Change in Cash and Cash Equivalents | (548) | (41,529) | 17,777
Cash and Cash Equivalents at Beginning of Period | 4,522 | 46,051 | 28,274
Cash and Cash Equivalents at End of Period | 3,974 | 4,522 | 46,051
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 120,955 | 115,043 | 103,382
Income taxes paid (refunded), net | 625 | (307) | (1,890)
PNM Resources |  |  |
Cash Flows From Operating Activities: |  |  |
Net Cash Flows From Operating Activities | (7,814) | 5,702 | 1,375
Cash Flows From Investing Activities: |  |  |
Utility plant additions | (180) | 341 | 368
Investments in subsidiaries | (50,000) | (98,343) | (175,000)
Cash dividends from subsidiaries | 105,084 | 35,959 | 127,688
Net cash flows from investing activities | 54,904 | (62,043) | (46,944)
Cash Flows From Financing Activities: |  |  |
Short-term loan |  | 100,000 | 50,000
Repayment of short-term loan | 0 | (150,000) | 0
Revolving credit facility borrowings (repayments), net | 42,600 | 84,500 | 41,000
Long-term borrowings |  | 100,000 | 150,000
Repayment of long-term debt | 0 | 0 | (118,766)
Proceeds from stock option exercise | 1,739 | 7,028 | 5,619
Purchases to satisfy awards of common stock | (13,929) | (15,451) | (17,720)
Dividends paid | (77,264) | (70,095) | (63,723)
Other, net | (269) | (28) | (782)
Net cash flows from financing activities | (47,123) | 55,954 | 45,628
Change in Cash and Cash Equivalents | (33) | (387) | 59
Cash and Cash Equivalents at Beginning of Period | 54 | 441 | 382
Cash and Cash Equivalents at End of Period | 21 | 54 | 441
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 10,899 | 5,906 | 7,559
Income taxes paid (refunded), net | $ 0 | $ 0 | $ (730)

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