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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of total pension cost
The components of total pension cost were as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
925

 
$
4,116

 
$
2,394

 
$
12,985

Interest cost
5,769

 
5,906

 
16,843

 
17,935

Expected return on plan assets
(9,469
)
 
(8,850
)
 
(26,710
)
 
(26,608
)
Amortization of prior service cost
4

 
(98
)
 
12

 
(296
)
Amortization of net loss (1)
983

 
2,142

 
2,994

 
8,456

Settlement charges (2)
5,283

 
—

 
5,283

 
—

Defined benefit plans
3,495

 
3,216

 
816

 
12,472

Multi-employer plans
217

 
192

 
634

 
587

Defined contribution plans
6,179

 
2,244

 
18,748

 
6,405

Total pension cost (3)
$
9,891

 
$
5,652

 
$
20,198

 
$
19,464



(1) The amortization of net loss during the nine months ended September 30, 2016 includes a $959 charge resulting from the deconsolidation of the Venezuelan subsidiary.
(2)
Pension settlement charges resulting from lump sum pension payments in the three and nine months ended September 30, 2017.
(3) The increase for the three and nine months ended September 30, 2017 as compared to the prior year periods reflect pension settlement charges and higher defined contribution plan expense related to the Company's amended U.S. defined contribution plan that was effective January 1, 2017, partially offset by lower service cost and lower amortization of net losses related to the defined benefit plan freeze effective December 31, 2016.