Quarterly report pursuant to Section 13 or 15(d)

Shareholder's Equity (Details)

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Shareholder's Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Shareholder's Equity (Textuals) [Abstract]        
StockRepurchaseProgramAuthorizedAmount $ 366,000   $ 366,000  
Purchase of common stock shares 8.8 12.1 13.8 26.7
Purchase of common stock shares, value     $ (150,847) $ (246,989)
Purchase of common stock, average price per share $ 11.2 $ 9.17 $ 10.92 $ 9.26