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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY      
Issuance of common stock related to share-based payment awards, income tax benefit $ 3,681 $ 5,952 $ 10,380