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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following table presents the components of the TNMP Plans’ net periodic benefit cost:
 
Three Months Ended June 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

 
$
33

 
$
—

 
$
—

Interest cost
672

 
656

 
113

 
119

 
8

 
7

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

 
—

Amortization of net (gain) loss
235

 
272

 
(110
)
 
(56
)
 
4

 
4

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Net Periodic Benefit Cost (Income)
$
(60
)
 
$
(63
)
 
$
(113
)
 
$
(39
)
 
$
12

 
$
11

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

 
$
—

 
$
26

 
$
67

 
$
—

 
$
—

Interest cost
1,344

 
1,312

 
226

 
238

 
16

 
15

Expected return on plan assets
(1,934
)
 
(1,981
)
 
(258
)
 
(271
)
 
—

 
—

Amortization of net (gain) loss
470

 
544

 
(220
)
 
(113
)
 
8

 
8

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Net Periodic Benefit Cost (Income)
$
(120
)
 
$
(125
)
 
$
(226
)
 
$
(79
)
 
$
24

 
$
23



The following table presents the components of the PNM Plans’ net periodic benefit cost:
 
Three Months Ended June 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

 
162

 
155

Expected return on plan assets
(8,527
)
 
(8,672
)
 
(1,318
)
 
(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
$
1,406

 
$
1,242

 
$
(406
)
 
$
(300
)
 
$
241

 
$
245

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

 
$
—

 
$
26

 
$
41

 
$
—

 
$
—

Interest cost
12,587

 
12,135

 
1,658

 
1,720

 
324

 
311

Expected return on plan assets
(17,051
)
 
(17,343
)
 
(2,636
)
 
(2,707
)
 
—

 
—

Amortization of net (gain) loss
7,759

 
8,174

 
338

 
1,177

 
158

 
179

Amortization of prior service cost
(483
)
 
(483
)
 
(198
)
 
(832
)
 
—

 
—

Net Periodic Benefit Cost
$
2,812

 
$
2,483

 
$
(812
)
 
$
(601
)
 
$
482

 
$
490