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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |
Net Cash Flows From Operating Activities | $ 415,454 | $ 386,874 | $ 414,876
Cash Flows From Investing Activities: |  |  |
Net cash flows from investing activities | (699,375) | (544,528) | (485,329)
Cash Flows From Financing Activities: |  |  |
Short-term loan | 100,000 | 50,000 | 0
Repayment of short-term loan | (150,000) | 0 | 0
Short-term borrowings (repayments), net | 86,500 | 95,000 | (43,600)
Long-term borrowings | 603,500 | 463,605 | 355,000
Repayment of long-term debt | (303,793) | (333,066) | (125,000)
Proceeds from stock option exercise | 7,028 | 5,619 | 6,999
Dividends paid | (70,623) | (64,251) | (59,468)
Other, net | 2,237 | (6,707) | (2,808)
Net cash flows from financing activities | 242,392 | 175,431 | 96,194
Change in Cash and Cash Equivalents | (41,529) | 17,777 | 25,741
Cash and Cash Equivalents at Beginning of Period | 46,051 | 28,274 | 2,533
Cash and Cash Equivalents at End of Period | 4,522 | 46,051 | 28,274
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 115,043 | 103,382 | 108,741
Income taxes paid (refunded), net | (307) | (1,890) | (2,597)
PNM Resources [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net Cash Flows From Operating Activities | 5,702 | 1,375 | 22,744
Cash Flows From Investing Activities: |  |  |
Utility plant additions | 341 | 368 | (474)
Investments in subsidiaries | (98,343) | (175,000) | 0
Cash dividends from subsidiaries | 35,959 | 127,688 | 46,599
Net cash flows from investing activities | (62,043) | (46,944) | 46,125
Cash Flows From Financing Activities: |  |  |
Short-term loan | 100,000 | 50,000 | 0
Repayment of short-term loan | (150,000) | 0 | 0
Short-term borrowings (repayments), net | 84,500 | 41,000 | 600
Long-term borrowings | 100,000 | 150,000 |
Repayment of long-term debt | 0 | (118,766) | 0
Proceeds from stock option exercise | 7,028 | 5,619 | 6,999
Purchases to satisfy awards of common stock | (15,451) | (17,720) | (17,319)
Dividends paid | (70,095) | (63,723) | (58,940)
Other, net | (28) | (782) | 81
Net cash flows from financing activities | 55,954 | 45,628 | (68,579)
Change in Cash and Cash Equivalents | (387) | 59 | 290
Cash and Cash Equivalents at Beginning of Period | 441 | 382 | 92
Cash and Cash Equivalents at End of Period | 54 | 441 | 382
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 5,906 | 7,559 | 12,152
Income taxes paid (refunded), net | $ 0 | $ (730) | $ (2,014)

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