Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Shareholders' Equity (Parenthetical)

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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
In Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Consolidated Statements of Shareholders' Equity    
Issuance of common stock from stock-based compensation awards, tax benefit $ 4,911 $ 2,064