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STOCK COMPENSATION Unvested RSU Transactions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Number of Shares [Roll Forward]    
Unvested beginning balance (in shares) 897  
Granted (in shares) 396  
Vested (in shares) (238)  
Forfeited (in shares) (19)  
Unvested ending balance (in shares) 1,036  
Weighted Average Grant Date Fair Value    
Unvested beginning balance (in dollars per share) $ 36.26 $ 32.50
Granted (in dollars per share) $ 38.74  
Vested (in dollars per share) $ 26.24  
Forfeited (in dollars per share) $ 35.74