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PENSION PLANS (Tables)
3 Months Ended
Mar. 31, 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
 
March 31,
2014
 
March 31,
2013
 
(in thousands)
Service costs
$
389

 
$
461

Interest costs
385

 
366

Amortization of actuarial loss
19

 
15

Net pension period cost
$
793

 
$
842