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PENSION PLANS (Tables)
3 Months Ended
Mar. 31, 2013
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,
2013
 
March 31,
2012
 
(In thousands)
Service cost
$
461

 
$
328

Interest cost
365

 
368

Amortization of actuarial loss
16

 
12

Net pension period cost
$
842

 
$
708