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v3.3.1.900

Fair Value of Derivative and Other Financial Instruments, Defined Benefit Plans Disclosure (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Public Service Company of New Mexico [Member] | Pension Plan [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | $ 587,909 | $ 556,353
Fair value of plan assets at end of year | 557,923 | 587,909
Public Service Company of New Mexico [Member] | Pension Plan [Member] | PNMR Master Trust [Member] | Fair Value Measurement [Domain] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 523,142 |
Fair value of plan assets at end of year | 479,858 | 523,142
Public Service Company of New Mexico [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 588,112 |
Fair value of plan assets at end of year | 558,319 | 588,112
Public Service Company of New Mexico [Member] | Pension Plan [Member] | PNMR Master Trust [Member] | Estimate of Fair Value Measurement [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 64,970 |
Fair value of plan assets at end of year | 78,461 | 64,970
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 74,139 | 79,018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 78,175 | 73,565
Fair value of plan assets at end of year | 72,952 | 78,175
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,242 |
Fair value of plan assets at end of year | 1,512 | 1,242
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 10,332 |
Fair value of plan assets at end of year | 10,604 | 10,332
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 8,365 |
Fair value of plan assets at end of year | 9,367 | 8,365
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 5,960 |
Fair value of plan assets at end of year | 5,894 | 5,960
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 30,997 |
Fair value of plan assets at end of year | 28,419 | 30,997
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 22,122 |
Fair value of plan assets at end of year | 18,343 | 22,122
Public Service Company of New Mexico [Member] | Level 1 [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 123,668 |
Fair value of plan assets at end of year | 111,441 | 123,668
Public Service Company of New Mexico [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 35,116 | 37,689
Public Service Company of New Mexico [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,242 |
Fair value of plan assets at end of year | 1,512 | 1,242
Public Service Company of New Mexico [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 8,365 |
Fair value of plan assets at end of year | 9,367 | 8,365
Public Service Company of New Mexico [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 5,960 |
Fair value of plan assets at end of year | 5,894 | 5,960
Public Service Company of New Mexico [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 22,122 |
Fair value of plan assets at end of year | 18,343 | 22,122
Public Service Company of New Mexico [Member] | Level 2 [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 398,819 |
Fair value of plan assets at end of year | 367,698 | 398,819
Public Service Company of New Mexico [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 39,023 | 41,329
Public Service Company of New Mexico [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 10,332 |
Fair value of plan assets at end of year | 10,604 | 10,332
Public Service Company of New Mexico [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 30,997 |
Fair value of plan assets at end of year | 28,419 | 30,997
Public Service Company of New Mexico [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] | Fixed Income Securities, Corporate [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year |  | 160
Actual return on assets sold during the period | 0 | 0
Actual return on assets still held at period end | (1) | (18)
Purchases | 177 | 546
Sales | (112) | (33)
Public Service Company of New Mexico [Member] | Level 3 [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 655 |
Fair value of plan assets at end of year | 719 | 655
Public Service Company of New Mexico [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Pension Plan [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 69,177 | 66,118
Fair value of plan assets at end of year | 62,082 | 69,177
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | PNMR Master Trust [Member] | Fair Value Measurement [Domain] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 59,320 |
Fair value of plan assets at end of year | 52,163 | 59,320
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 69,207 |
Fair value of plan assets at end of year | 62,131 | 69,207
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | PNMR Master Trust [Member] | Estimate of Fair Value Measurement [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 9,887 |
Fair value of plan assets at end of year | 9,968 | 9,887
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 9,290 | 10,211
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 10,094 | 9,601
Fair value of plan assets at end of year | 9,111 | 10,094
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 168 |
Fair value of plan assets at end of year | 128 | 168
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,277 |
Fair value of plan assets at end of year | 1,310 | 1,277
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 403 |
Fair value of plan assets at end of year | 367 | 403
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,024 |
Fair value of plan assets at end of year | 1,013 | 1,024
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 3,790 |
Fair value of plan assets at end of year | 3,397 | 3,790
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 3,549 |
Fair value of plan assets at end of year | 3,075 | 3,549
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 14,823 |
Fair value of plan assets at end of year | 12,199 | 14,823
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 4,583 | 5,144
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 168 |
Fair value of plan assets at end of year | 128 | 168
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 403 |
Fair value of plan assets at end of year | 367 | 403
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,024 |
Fair value of plan assets at end of year | 1,013 | 1,024
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 1 [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 3,549 |
Fair value of plan assets at end of year | 3,075 | 3,549
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 44,425 |
Fair value of plan assets at end of year | 39,886 | 44,425
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 4,707 | 5,067
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,277 |
Fair value of plan assets at end of year | 1,310 | 1,277
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 3,790 |
Fair value of plan assets at end of year | 3,397 | 3,790
Texas-New Mexico Power Company [Member] | Level 2 [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Fixed Income Securities, Corporate [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year |  | 16
Actual return on assets sold during the period | 0 | 0
Actual return on assets still held at period end | 0 | (2)
Purchases | 17 | 62
Sales | (11) | (4)
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Pension Plan [Member] | PNMR Master Trust [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 72 |
Fair value of plan assets at end of year | 78 | 72
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of plan assets owned | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] | Other Postretirement Benefits [Member] | Fixed income securities, Mutual funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Fair Value Measurement [Domain] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 582,462 |
Fair value of plan assets at end of year | 532,021 | 582,462
PNMR [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 657,319 |
Fair value of plan assets at end of year | 620,450 | 657,319
PNMR [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 15,645 |
Fair value of plan assets at end of year | 14,525 | 15,645
PNMR [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 23,282 |
Fair value of plan assets at end of year | 36,675 | 23,282
PNMR [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 41,778 |
Fair value of plan assets at end of year | 34,769 | 41,778
PNMR [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 28,370 |
Fair value of plan assets at end of year | 25,407 | 28,370
PNMR [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 29,719 |
Fair value of plan assets at end of year | 30,531 | 29,719
PNMR [Member] | Fixed Income Securities, Corporate [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 242,742 |
Fair value of plan assets at end of year | 214,218 | 242,742
PNMR [Member] | Fixed Income Securities, U.S. Government [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 106,634 |
Fair value of plan assets at end of year | 98,138 | 106,634
PNMR [Member] | Fixed Income Securities, Municipals [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 20,156 |
Fair value of plan assets at end of year | 16,647 | 20,156
PNMR [Member] | Fixed Income Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 74,136 |
Fair value of plan assets at end of year | 61,111 | 74,136
PNMR [Member] | Private Equity Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 37,220 |
Fair value of plan assets at end of year | 32,333 | 37,220
PNMR [Member] | Hedge Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 23,876 |
Fair value of plan assets at end of year | 40,731 | 23,876
PNMR [Member] | Real Estate [Member] | Estimate of Fair Value Measurement [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 13,761 |
Fair value of plan assets at end of year | 15,365 | 13,761
PNMR [Member] | Level 1 [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 138,491 |
Fair value of plan assets at end of year | 123,640 | 138,491
PNMR [Member] | Level 1 [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 15,645 |
Fair value of plan assets at end of year | 14,525 | 15,645
PNMR [Member] | Level 1 [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 1 [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 41,778 |
Fair value of plan assets at end of year | 34,769 | 41,778
PNMR [Member] | Level 1 [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 28,370 |
Fair value of plan assets at end of year | 25,407 | 28,370
PNMR [Member] | Level 1 [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 1 [Member] | Fixed Income Securities, Corporate [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 1 [Member] | Fixed Income Securities, U.S. Government [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 52,537 |
Fair value of plan assets at end of year | 48,936 | 52,537
PNMR [Member] | Level 1 [Member] | Fixed Income Securities, Municipals [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 1 [Member] | Fixed Income Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 161 |
Fair value of plan assets at end of year | 3 | 161
PNMR [Member] | Level 2 [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 443,244 |
Fair value of plan assets at end of year | 407,584 | 443,244
PNMR [Member] | Level 2 [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 2 [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 23,282 |
Fair value of plan assets at end of year | 36,675 | 23,282
PNMR [Member] | Level 2 [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 2 [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 2 [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 29,719 |
Fair value of plan assets at end of year | 30,531 | 29,719
PNMR [Member] | Level 2 [Member] | Fixed Income Securities, Corporate [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 242,015 |
Fair value of plan assets at end of year | 213,421 | 242,015
PNMR [Member] | Level 2 [Member] | Fixed Income Securities, U.S. Government [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 54,097 |
Fair value of plan assets at end of year | 49,202 | 54,097
PNMR [Member] | Level 2 [Member] | Fixed Income Securities, Municipals [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 20,156 |
Fair value of plan assets at end of year | 16,647 | 20,156
PNMR [Member] | Level 2 [Member] | Fixed Income Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 73,975 |
Fair value of plan assets at end of year | 61,108 | 73,975
PNMR [Member] | Level 3 [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 727 |
Fair value of plan assets at end of year | 797 | 727
PNMR [Member] | Level 3 [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Equity Securities, International Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Equity Securities, Domestic Value [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Equity Securities, Domestic Growth [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Equity Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Fixed Income Securities, Corporate [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 727 | 176
Actual return on assets sold during the period | 0 | 0
Actual return on assets still held at period end | (1) | (20)
Purchases | 194 | 608
Sales | (123) | (37)
Fair value of plan assets at end of year | 797 | 727
PNMR [Member] | Level 3 [Member] | Fixed Income Securities, U.S. Government [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Fixed Income Securities, Municipals [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Fixed Income Securities, Other Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
PNMR [Member] | Level 3 [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 655 |
Fair value of plan assets at end of year | 719 | 655
PNMR [Member] | Level 3 [Member] | Hedge Funds [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 72 |
Fair value of plan assets at end of year | $ 78 | $ 72

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