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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Change in accumulated other comprehensive loss        
Balance at the beginning of the period     $ (341)  
Net current-period other comprehensive loss (11) (8) (32) (24)
Balance at the end of the period (309)   (309)  
Net tax benefit 921 729 2,260 2,077
Defined benefit pension plans
       
Change in accumulated other comprehensive loss        
Balance at the beginning of the period     (341)  
Amounts reclassified from accumulated other comprehensive loss     32  
Net current-period other comprehensive loss     32  
Balance at the end of the period (309)   (309)  
Defined benefit pension plans | Reclassified from accumulated other comprehensive loss
       
Change in accumulated other comprehensive loss        
Net tax benefit     $ 0