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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
The components of total pension cost were as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Service cost
$
4,228

 
$
6,144

 
$
14,372

 
$
17,563

Interest cost
10,647

 
8,954

 
31,924

 
27,852

Expected return on plan assets
(16,940
)
 
(14,667
)
 
(51,009
)
 
(45,931
)
Amortization of prior service cost
(154
)
 
(153
)
 
(461
)
 
(459
)
Amortization of net loss
4,815

 
7,045

 
13,246

 
23,262

Settlement/curtailment loss
1,562

 
—

 
1,562

 
—

Defined benefit plans
4,158

 
7,323

 
9,634

 
22,287

Multi-employer plans
250

 
237

 
781

 
702

Defined contribution plans
2,898

 
2,599

 
8,551

 
7,791

Total pension cost
$
7,306

 
$
10,159

 
$
18,966

 
$
30,780


The Company voluntarily contributed $21,175 to its defined benefit plans in the United States during the nine months ended September 30, 2014. The amortization of net loss decreased due to greater actuarial gains during 2013, attributable to a higher discount rate and higher actual return on plan assets compared with the expected return on assets.