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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of performance share units activity
The following table summarizes PSU activity for the quarter ended March 31, 2013:
 
 
Units
 
 
(in thousands)
Balance, January 1, 2013
 
627

Granted
 
170

Vested and Paid
 

Forfeited
 

Balance, March 31, 2013
 
797

Summary of restricted stock units activity
The following table summarizes RSU activity for the quarter ended March 31, 2013:
 
 
Units
 
 
(in thousands)
Balance, January 1, 2013
 
604

Granted
 
92

Vested and Paid
 

Forfeited
 
(1
)
Balance, March 31, 2013
 
695