Quarterly report pursuant to Section 13 or 15(d)

Shareholder's Equity (Details)

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Shareholder's Equity (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Shareholder's Equity (Textuals) [Abstract]        
Stock Repurchase Program, Authorized Amount $ 250,000,000      
Purchase of common stock shares, value     $ (299,720,000) $ (124,995,000)
Purchase of common stock, average price per share $ 9.7 $ 8.18 $ 9.34 $ 7.46