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Retirement and Benefit Plans
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Retirement and Benefit Plans
Retirement and Benefit Plans
 
The following table presents the pension benefit costs:
 
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
2016
 
2015
 
2016
 
2015
 
(thousands)
Service cost
$
279

 
$
12

 
$
846

 
$
726

Interest cost
4,805

 
4,808

 
14,376

 
14,259

Expected return on plan assets
(5,131
)
 
(5,844
)
 
(15,310
)
 
(16,539
)
Amortization of actuarial loss
584

 
987

 
1,540

 
3,897

Plan settlement loss
—

 
—

 
297

 
501

Net periodic benefit expense
$
537

 
$
(37
)
 
$
1,749

 
$
2,844


 
During the nine months ended September 30, 2016, we contributed $3.3 million in cash to the pension plans. For the remainder of 2016, we expect to make approximately $0.5 million in additional cash contributions to the pension plans.

During the third quarter 2016, we offered a program whereby certain terminated vested participants and active employees of the Boise Cascade Company Pension Plan could elect to take a one-time voluntary lump-sum payment equal to the present value of future benefits. Active employees are required to retire on or before November 1, 2016 to receive their lump-sum benefits. This program closed on September 30, 2016 with participants electing lump-sum payments totaling approximately $21 million. Plan participants who elected to participate in the program will receive their lump-sum benefits on November 1, 2016. Settlement expense will be recorded in fourth quarter 2016.