XML 114 R83.htm IDEA: XBRL DOCUMENT v3.6.0.2
Pension and Other Postretirement Benefits - APBO, PBO, Fair Value of Plan Assets, and Funded Status of the Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability $ 125,844 $ 73,097  
Public Service Company of New Mexico [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 114,427 66,285  
Public Service Company of New Mexico [Member] | Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 597,900 657,557  
Service cost 0 0 $ 0
Interest cost 30,307 28,255 30,163
Actuarial (gain) loss 39,463 (38,151)  
Benefits paid (45,919) (49,761)  
Balance at end of year 621,751 597,900 657,557
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 557,923 587,909  
Actual return on plan assets 31,597 (10,225)  
Employer contributions 0 30,000  
Benefits paid (45,919) (49,761)  
Fair value of plan assets at end of year 543,601 557,923 587,909
Funded status – asset (liability) for pension benefits (78,150) (39,977)  
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 84,674 95,175  
Service cost 140 204 181
Interest cost 4,346 4,089 4,630
Participant contributions 2,690 2,439  
Actuarial (gain) loss 17,877 (6,565)  
Benefits paid (11,734) (10,668)  
Plan design changes (3,724) 0  
Balance at end of year 94,269 84,674 95,175
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 72,952 78,175  
Actual return on plan assets 5,923 (617)  
Employer contributions 2,863 3,623  
Participant contributions 2,690 2,439  
Benefits paid (11,734) (10,668)  
Fair value of plan assets at end of year 72,694 72,952 78,175
Funded status – asset (liability) for pension benefits (21,575) (11,722)  
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 16,105 17,730  
Service cost 0 0 0
Interest cost 812 760 822
Actuarial (gain) loss 768 (908)  
Benefits paid (1,473) (1,477)  
Balance at end of year 16,212 16,105 17,730
Less current liability 1,510 1,519  
Non-current liability 14,702 14,586  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Benefits paid (1,473) (1,477)  
Texas-New Mexico Power Company [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 11,417 6,812  
Texas-New Mexico Power Company [Member] | Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 64,198 72,305  
Service cost 0 0 0
Interest cost 3,304 3,043 3,193
Actuarial (gain) loss 4,318 (5,157)  
Benefits paid (4,759) (5,993)  
Balance at end of year 67,061 64,198 72,305
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 62,082 69,177  
Actual return on plan assets 3,301 (1,102)  
Employer contributions 0 0  
Benefits paid (4,759) (5,993)  
Fair value of plan assets at end of year 60,624 62,082 69,177
Funded status – asset (liability) for pension benefits (6,437) (2,116)  
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 13,106 14,070  
Service cost 186 247 237
Interest cost 677 608 619
Participant contributions 520 320  
Actuarial (gain) loss (96) (575)  
Benefits paid (1,563) (1,564)  
Plan design changes 0 0  
Balance at end of year 12,830 13,106 14,070
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 9,111 10,094  
Actual return on plan assets 476 (82)  
Employer contributions 0 343  
Participant contributions 520 320  
Benefits paid (1,563) (1,564)  
Fair value of plan assets at end of year 8,544 9,111 10,094
Funded status – asset (liability) for pension benefits (4,286) (3,995)  
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 794 878  
Service cost 0 0 0
Interest cost 40 36 39
Actuarial (gain) loss 47 (26)  
Benefits paid (94) (94)  
Balance at end of year 787 794 $ 878
Less current liability 93 93  
Non-current liability 694 701  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Benefits paid $ (94) $ (94)