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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2020
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 March 31,
Pension Plan
OPEB Plan
Executive Retirement Program
202020192020201920202019
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$—  $—  $10  $13  $—  $—  
Interest cost
4,985  6,294  613  829  122  162  
Expected return on plan assets
(7,363) (8,527) (1,387) (1,318) —  —  
Amortization of net (gain) loss
4,465  3,880  87  169  101  79  
Amortization of prior service cost
(138) (241) —  (99) —  —  
Net Periodic Benefit Cost (Income)
$1,949  $1,406  $(677) $(406) $223  $241  
The following table presents the components of the TNMP Plans’ net periodic benefit cost:
Three Months Ended March 31,
Pension Plan
OPEB Plan
Executive Retirement Program
202020192020201920202019
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$—  $—  $12  $13  $—  $—  
Interest cost
544  672  93  113  6  8  
Expected return on plan assets
(821) (967) (134) (129) —  —  
Amortization of net (gain) loss
315  235  (81) (110) 6  4  
Net Periodic Benefit Cost (Income)
$38  $(60) $(110) $(113) $12  $12