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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following table presents the components of the PNM Plans’ net periodic benefit cost:
 
Three Months Ended September 30,
 
Pension Plan
 
OPEB Plan
 
Executive Retirement Program
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(In thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
13

 
$
21

 
$
—

 
$
—

Interest cost
6,294

 
6,068

 
829

 
860

 
163

 
155

Expected return on plan assets
(8,527
)
 
(8,672
)
 
(1,320
)
 
(1,353
)
 
—

 
—

Amortization of net (gain) loss
3,880

 
4,087

 
169

 
588

 
79

 
90

Amortization of prior service cost
(241
)
 
(241
)
 
(99
)
 
(416
)
 
—

 
—

Net Periodic Benefit Cost (Income)
$
1,406

 
$
1,242

 
$
(408
)
 
$
(300
)
 
$
242

 
$
245

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
Pension Plan
 
OPEB Plan
 
Executive Retirement Program
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(In thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
39

 
$
62

 
$
—

 
$
—

Interest cost
18,881

 
18,203

 
2,487

 
2,579

 
487

 
467

Expected return on plan assets
(25,577
)
 
(26,014
)
 
(3,956
)
 
(4,061
)
 
—

 
—

Amortization of net (gain) loss
11,639

 
12,261

 
507

 
1,765

 
237

 
269

Amortization of prior service cost
(724
)
 
(724
)
 
(297
)
 
(1,248
)
 
—

 
—

Net Periodic Benefit Cost (Income)
$
4,219

 
$
3,726

 
$
(1,220
)
 
$
(903
)
 
$
724

 
$
736


The following table presents the components of the TNMP Plans’ net periodic benefit cost:
 
Three Months Ended September 30,
 
Pension Plan
 
OPEB Plan
 
Executive Retirement Program
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(In thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
12

 
$
33

 
$
—

 
$
—

Interest cost
672

 
656

 
113

 
119

 
7

 
7

Expected return on plan assets
(967
)
 
(991
)
 
(129
)
 
(135
)
 
—

 
—

Amortization of net (gain) loss
235

 
272

 
(111
)
 
(56
)
 
4

 
4

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Net Periodic Benefit Cost (Income)
$
(60
)
 
$
(63
)
 
$
(115
)
 
$
(39
)
 
$
11

 
$
11

 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
Pension Plan
 
OPEB Plan
 
Executive Retirement Program
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(In thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
39

 
$
100

 
$
—

 
$
—

Interest cost
2,015

 
1,968

 
338

 
358

 
24

 
22

Expected return on plan assets
(2,901
)
 
(2,972
)
 
(387
)
 
(406
)
 
—

 
—

Amortization of net (gain) loss
706

 
816

 
(332
)
 
(170
)
 
11

 
11

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Net Periodic Benefit Cost (Income)
$
(180
)
 
$
(188
)
 
$
(342
)
 
$
(118
)
 
$
35

 
$
33