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PENSION AND OTHER POSTRETIREMENT BENEFITS
 9 Months Ended
Sep. 30, 2016
Pension and Other Postretirement Benefit Expense [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFITS
PENSION AND OTHER POSTRETIREMENT BENEFITS
The following table sets forth the components of the net periodic benefit cost for the Company's pension and other postretirement benefit plans (in thousands):
 
Pension Benefits
 
Other Benefits
 
Three Months Ended September 30,
 
Three Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Service cost
$
468

 
$
1,851

 
$
—

 
$
(2
)
Interest cost
2,416

 
3,055

 
49

 
60

Expected return on plan assets
(3,862
)
 
(3,564
)
 
—

 
—

Amortization of prior service credit
—

 
—

 
(280
)
 
(420
)
Recognized actuarial loss (gain)
123

 
1,158

 
(62
)
 
(209
)
Net periodic benefit (income) cost
$
(855
)
 
$
2,500

 
$
(293
)
 
$
(571
)

For the three months ended September 30, 2016, $0.5 million of pension income was recognized in cost of sales and $0.4 million was recognized in selling, general, and administrative expenses. For the three months ended September 30, 2015, $1.5 million of pension expense was incurred in cost of sales and $1.0 million was incurred in selling, general, and administrative expenses.
 
Pension Benefits
 
Other Benefits
 
Nine Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Service cost
$
1,404

 
$
5,626

 
$
—

 
$
5

Interest cost
7,248

 
9,283

 
147

 
221

Expected return on plan assets
(11,086
)
 
(10,874
)
 
—

 
—

Amortization of prior service credit
—

 
—

 
(840
)
 
(564
)
Recognized actuarial loss (gain)
369

 
5,490

 
(186
)
 
(25
)
Net periodic benefit (income) cost
$
(2,065
)
 
$
9,525

 
$
(879
)
 
$
(363
)

For the nine months ended September 30, 2016, $1.1 million of pension income was recognized in cost of sales and $0.9 million was recognized in selling, general, and administrative expenses. For the nine months ended September 30, 2015, $5.2 million of pension expense was incurred in cost of sales and $4.3 million was incurred in selling, general, and administrative expenses.
During nine months ended September 30, 2016, the Company contributed $8.0 million and $2.0 million in discretionary contributions to the union and nonunion pension plans, respectively.