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Schedule I - Condensed Financial Information of Parent Company - Statement of Cash flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)