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PENSION PLANS (Tables)
9 Months Ended
Sep. 30, 2014
Pension and Other Postretirement Benefit Expense [Abstract]  
Aggregate net pension expense relating to the two plan types
The aggregate net pension expense relating to these two plans are as follows:
 
 
Three Months Ended
 
 Nine Months Ended
 
September 30,
2014
 
September 30,
2013
 
September 30,
2014
 
September 30,
2013
 
(in thousands)
Service costs
$
383

 
$
459

 
$
1,165

 
$
1,371

Interest costs
378

 
363

 
1,151

 
1,085

Amortization of actuarial loss
18

 
16

 
56

 
47

Net pension period cost
$
779

 
$
838

 
$
2,372

 
$
2,503