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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The following tables present the components of the PNM Plans’ net periodic benefit cost:
 
Three Months Ended March 31,
 
Pension Plan
 
OPEB Plan
 
Executive Retirement Program
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
24

 
$
35

 
$
—

 
$
—

Interest cost
6,727

 
7,577

 
1,006

 
1,087

 
174

 
203

Expected return on plan assets
(8,451
)
 
(8,854
)
 
(1,308
)
 
(1,371
)
 
—

 
—

Amortization of net (gain) loss
4,001

 
3,455

 
921

 
286

 
78

 
64

Amortization of prior service cost
(241
)
 
(241
)
 
(416
)
 
(7
)
 
—

 
—

Net periodic benefit cost
$
2,036

 
$
1,937

 
$
227

 
$
30

 
$
252

 
$
267


The following tables present the components of the TNMP Plans’ net periodic benefit cost (income):
 
Three Months Ended March 31,
 
Pension Plan
 
OPEB Plan
 
Executive Retirement Program
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
Components of Net Periodic Benefit Cost (Income)
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
36

 
$
46

 
$
—

 
$
—

Interest cost
722

 
826

 
139

 
169

 
8

 
10

Expected return on plan assets
(945
)
 
(986
)
 
(114
)
 
(122
)
 
—

 
—

Amortization of net (gain) loss
231

 
175

 
(20
)
 
(10
)
 
2

 
1

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Net Periodic Benefit Cost (Income)
$
8

 
$
15

 
$
41

 
$
83

 
$
10

 
$
11