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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Public Service Company of New Mexico [Member]  
Defined Benefit Plan Disclosure [Line Items]  
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
(In thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
35

 
$
51

 
$
—

 
$
—

Interest cost
7,577

 
7,064

 
1,087

 
1,022

 
203

 
190

Expected return on plan assets
(8,854
)
 
(9,831
)
 
(1,371
)
 
(1,403
)
 
—

 
—

Amortization of net (gain) loss
3,455

 
3,705

 
286

 
491

 
64

 
81

Amortization of prior service cost
(241
)
 
(241
)
 
(7
)
 
(160
)
 
—

 
—

Net periodic benefit cost
$
1,937

 
$
697

 
$
30

 
$
1

 
$
267

 
$
271
Texas-New Mexico Power Company [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
(In thousands)
Components of Net Periodic Benefit Cost (Income)
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
46

 
$
62

 
$
—

 
$
—

Interest cost
826

 
761

 
169

 
152

 
10

 
9

Expected return on plan assets
(986
)
 
(1,105
)
 
(122
)
 
(130
)
 
—

 
—

Amortization of net (gain) loss
175

 
195

 
(10
)
 
—

 
1

 
1

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Net Periodic Benefit Cost (Income)
$
15

 
$
(149
)
 
$
83

 
$
84

 
$
11

 
$
10