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Benefit Plans
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
Tables 10.1 and 10.2 provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for the three and nine months ended September 30, 2019 and 2018.
Components of net periodic benefit cost
Table
10.1
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
2,086

 
$
2,633

 
$
337

 
$
290

Interest cost
 
3,926

 
3,774

 
283

 
208

Expected return on plan assets
 
(4,866
)
 
(5,563
)
 
(1,447
)
 
(1,590
)
Amortization of net actuarial losses/(gains)
 
2,103

 
1,734

 
—

 
(62
)
Amortization of prior service cost/(credit)
 
(71
)
 
(88
)
 
(8
)
 
(1,026
)
Net periodic benefit cost (benefit)
 
$
3,178

 
$
2,490

 
$
(835
)
 
$
(2,180
)
Components of net periodic benefit cost
Table
10.2
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefits
(in thousands)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
6,258

 
$
7,898

 
$
1,009

 
$
870

Interest cost
 
11,779

 
11,321

 
848

 
625

Expected return on plan assets
 
(14,599
)
 
(16,688
)
 
(4,339
)
 
(4,769
)
Recognized net actuarial gain (loss)
 
6,309

 
5,203

 
—

 
(187
)
Amortization of prior service cost
 
(211
)
 
(263
)
 
(25
)
 
(3,078
)
Net period benefit cost (benefit)
 
$
9,536

 
$
7,471

 
$
(2,507
)
 
$
(6,539
)


We currently intend to make contributions totaling $10.2 million to our qualified pension plan and supplemental executive retirement plan in 2019.