Quarterly report pursuant to Section 13 or 15(d)

Shareholder's Equity (Details)

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Shareholder's Equity (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Shareholder's Equity (Textuals) [Abstract]    
Stock Repurchase Program, Authorized Amount $ 227,000,000  
Purchase of common stock shares 4.7  
Purchase of common stock shares, value $ (33,600,000) $ 0
Purchase of common stock, average price per share $ 7.07