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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS
 9 Months Ended
Sep. 29, 2019
Retirement Benefits [Abstract]  
Pension and Other Post-Retirement Benefit Plans PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS
Net Periodic Benefit Cost
The components of net periodic benefit cost for the three months ended September 29, 2019 and September 30, 2018 were as follows:  
 
 
Pension Benefits
Other Benefits
 
 
Three Months Ended
 
Three Months Ended
 
 
September 29, 2019
 
September 30, 2018
 
September 29, 2019
 
September 30, 2018
Service cost
 
$
5,209

 
$
5,272

 
$
39

 
$
56

Interest cost
 
9,153

 
7,487

 
1,958

 
1,730

Expected return on plan assets
 
(13,494
)
 
(14,455
)
 
—

 
—

Amortization of prior service (credit) cost
 
(1,808
)
 
(1,804
)
 
203

 
209

Amortization of net loss (gain)
 
8,421

 
6,784

 
(96
)
 
—

Settlement loss
 
4,817

 
6,893

 
—

 
—

Total net periodic benefit cost
 
$
12,298

 
$
10,177

 
$
2,104

 
$
1,995



We made contributions of $901 and $4,039 to the pension plans and other benefits plans, respectively, during the third quarter of 2019. In the third quarter of 2018, we made contributions of $6,350 and $6,276 to our pension plans and other benefit plans, respectively. The contributions in 2019 and 2018 also included benefit payments from our non-qualified pension plans and post-retirement benefit plans.
The components of net periodic benefit cost for the nine months ended September 29, 2019 and September 30, 2018 were as follows:  
 
 
Pension Benefits
Other Benefits
 
 
Nine Months Ended
 
Nine Months Ended
 
 
September 29, 2019
 
September 30, 2018
 
September 29, 2019
 
September 30, 2018
Service cost
 
$
15,626

 
$
15,931

 
$
114

 
$
172

Interest cost
 
27,459

 
23,153

 
5,876

 
5,194

Expected return on plan assets
 
(40,483
)
 
(43,973
)
 
—

 
—

Amortization of prior service (credit) cost
 
(5,425
)
 
(5,402
)
 
609

 
627

Amortization of net loss (gain)
 
25,262

 
20,155

 
(288
)
 
—

Settlement loss
 
4,817

 
6,893

 
—

 
—

Total net periodic benefit cost
 
$
27,256

 
$
16,757

 
$
6,311

 
$
5,993



We made contributions of $2,071 and $11,788 to the pension plans and other benefits plans, respectively, during the first nine months of 2019. In the first nine months of 2018, we made contributions of $7,651 and $19,054 to our pension plans and other benefit plans, respectively. The contributions in 2019 and 2018 also included benefit payments from our non-qualified pension plans and post-retirement benefit plans.

During the third quarter of 2019, we recognized pension settlement charges in our hourly retirement plan due to lump sum withdrawals by employees retiring or leaving the Company as a result of the Margin for Growth Program.
During the third quarter of 2018, we recognized pension settlement charges in our hourly retirement plan due to lump
sum withdrawals by employees retiring or leaving the Company as a result of the Operational Optimization Program
and due to lump sum distributions in our supplemental executive retirement plan. In each case, the non-cash settlement charges, which represent the acceleration of a portion of the respective plan’s accumulated unrecognized actuarial loss, were triggered when the cumulative lump sum distributions exceeded the plan's anticipated annual service and interest
costs. In connection with the third quarter 2019 settlements, the related plan assets and liabilities were remeasured using a discount rate as of the remeasurement date that was 111 basis points lower than the rate as of December 31, 2018 and an expected rate of return on plan assets of 6.0%.