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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF EQUITY  
Issuance of shares of common stock upon exercise of stock options 51,602
Purchase of shares of common stock 5,470
Non-controlling interest in equity acquired, net of tax $ 2,280
Other comprehensive income before reclassifications, tax $ 1,327