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Shareholders' Equity Shareholders' Equity (Common Stock Buyback) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Common Stock Buyback [Abstract]      
Stock Repurchased and Retired During Period, Shares 7,528,000 11,109,000 5,814,000
Stock Repurchased During Period, Value $ 155,264 $ 211,165 $ 120,982