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PENSIONS AND OTHER POST-RETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Summary of the costs of the Company's employee pension and post retirement plans

 
Pension Benefits
 
Other Benefits
 
Six months ended
 
Six months ended
 
June 30,
 
June 30,
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
Service cost
$
3,468

 
$
4,004

 
$
12

 
$
18

Interest cost
6,670

 
6,032

 
182

 
162

Expected return on plan assets
(7,872
)
 
(6,956
)
 
—

 
—

Amortization of prior service cost
6

 
8

 
(1,122
)
 
(1,688
)
Recognized actuarial loss
1,004

 
4,312

 
308

 
384

Net periodic benefit cost
$
3,276

 
$
7,400

 
$
(620
)
 
$
(1,124
)

For the six months ended June 30, 2014, $1.9 million of pension expense was incurred in cost of sales and $1.4 million was incurred in selling, general, and administrative expenses. For the six months ended June 30, 2013, $4.4 million of pension expense was incurred in cost of sales and $3.0 million was incurred in selling, general, and administrative expenses.