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Repurchases of Common Stock (Summary of Stock Repurchases During the Year) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Class of Stock Disclosures [Abstract]    
Repurchase of common stock $ (70,587) $ (545,156)