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 Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Shareholder's Equity (Textuals) [Abstract]        
Stock Repurchase Program, Authorized Amount $ 227,000,000      
Purchase of common stock shares 10,000 0    
Purchase of common stock shares, value     $ (108,798,000) $ (40,230,000)
Purchase of common stock, average price per share $ 7.50