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Shareholders' Equity (Narrative) (Details) (USD $)
1 Months Ended 6 Months Ended
May 31, 2010
Jun. 30, 2010
Shareholders' Equity    
Sale of repurchased common stock 4,300,000  
Repurchased common stock price per share $ 35.00  
Proceeds from issuance of common stock $ 143,300,000 $ 143,325,000
Reduction to retained earnings 42,800,000  
Historical cost of stock issued $ 186,100,000