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Significant Accounting Policies and Responsibility for Financial Statements (Details) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 24, 2018 power_purchase_agreement | Sep. 30, 2018 USD ($) $ / shares MW | Jun. 30, 2018 $ / shares | Dec. 31, 2017 USD ($) power_purchase_agreement | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Sep. 30, 2018 USD ($) $ / shares MW | Sep. 30, 2017 USD ($) $ / shares | Sep. 05, 2017 MW | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment defaults under agreements |  | $ 0 |  |  |  |  | $ 0 |  |  |  |
Dividends declared per common share (dollars per share) | $ / shares |  | $ 0.2650 |  |  | $ 0.2425 |  | $ 0.7950 | $ 0.7275 |  |  |
Dividends declared on common stock |  |  |  |  |  |  | $ 63,325,000 |  |  |  |
Revenues |  | $ 422,666,000 |  |  | $ 419,900,000 |  | 1,092,857,000 | $ 1,112,398,000 |  |  |
Construction work in progress |  | 227,367,000 |  | $ 245,933,000 |  |  | 227,367,000 |  |  |  |
Owners' equity |  | 1,771,298,000 |  | 1,695,253,000 |  |  | 1,771,298,000 |  |  |  |
Cash and cash equivalents |  | $ 34,964,000 |  | 3,974,000 | $ 43,149,000 |  | $ 34,964,000 | 43,149,000 |  | $ 5,522,000 |
NMRD |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Renewable energy capacity in operating (in mw) | MW |  | 34.3 |  |  |  |  | 34.3 |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (dollars per share) | $ / shares |  | $ 0.2650 | $ 0.2650 |  | $ 0.2425 | $ 0.2425 |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  | $ 25,804,000 | 29,700,000 |  |  |
Revenues |  | $ 91,292,000 |  |  | $ 92,646,000 |  | 260,741,000 | 257,489,000 |  |  |
Net earnings |  | 16,100,000 |  |  | $ 14,727,000 |  | 40,879,000 | $ 34,535,000 |  |  |
Construction work in progress |  | 77,456,000 |  | 34,350,000 |  |  | 77,456,000 |  |  |  |
Owners' equity |  | 649,480,000 |  | 634,405,000 |  |  | 649,480,000 |  |  |  |
Cash and cash equivalents |  | 0 |  | 1,700,000 |  |  | 0 |  |  |  |
NMRD |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 1,000,000 |  |  |  |  | 2,500,000 |  |  |  |
Net earnings |  | 500,000 |  |  |  |  | 1,000,000 |  |  |  |
Cash |  | 2,300,000 |  |  |  |  | 2,300,000 |  |  |  |
Construction work in progress |  | 50,400,000 |  |  |  |  | 50,400,000 |  |  |  |
Accounts payable |  | 700,000 |  |  |  |  | 700,000 |  |  |  |
Owners' equity |  | $ 52,000,000 |  |  |  |  | $ 52,000,000 |  |  |  |
PNMR Development |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Solar generation capacity (in megawatts) | MW |  | 30 |  |  |  |  | 30 |  | 50 |  |
PNMR Development | NMRD |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |  | 50.00% |  |  |
PNMR Development and AEP OnSite | NMRD |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution to construction activities |  |  |  |  |  |  | $ 9,000,000 |  |  |  |
PNM |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 331,374,000 |  |  | $ 327,254,000 |  | 832,116,000 | $ 854,909,000 |  |  |
Net earnings |  | 77,508,000 |  |  | 60,827,000 |  | 112,018,000 | 104,417,000 |  |  |
Construction work in progress |  | 141,174,000 |  | 204,079,000 |  |  | 141,174,000 |  |  |  |
Owners' equity |  | 1,537,576,000 |  | 1,422,174,000 |  |  | 1,537,576,000 |  |  |  |
Third party deposits |  |  |  |  |  | $ 1,000,000 |  |  |  | 7,200,000 | $ 8,200,000
Cash and cash equivalents |  | $ 31,486,000 |  | 1,108,000 | $ 39,370,000 |  | $ 31,486,000 | $ 39,370,000 |  | 1,324,000 |
Accounting Standards Update 2016-18 | PNM |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 1,000,000 |  |  |  | $ 1,000,000 |
Accounting Standards Update 2016-18 | NMCUC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 100,000 |  |  |  |  |  |  |
Facebook Data Center |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of additional PPAs | power_purchase_agreement | 2 |  |  | 3 |  |  |  |  |  |  |
Power purchase agreement term | 25 years |  |  | 25 years |  |  |  |  |  |  |

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