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SHARE-BASED COMPENSATION Stock-Based Compensation - Stock Options (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding 203,903
Weighted Average Exercise Price $ 20.27
Exercised (38,596)
Outstanding 165,307
Weighted Average Exercise Price $ 20.90
Exercisable 165,307
Weighted Average Exercise Price Exercisable $ 20.90
ShareBasedCompensationArrangementByShareBasedPayment Award Excercises in Period Weighted Average Excercise Price $ 17.56