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Stockholders' Equity (Number and Cost of Common Stock Shares Repurchased) (Details) (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Stockholders' Equity    
Common stock repurchased (in shares) 2,958 2,486
Common stock repurchased $ 85,851 $ 65,569