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Shareholders' Equity (Narrative) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Class of Stock [Line Items]        
Common Stock, Dividends, Per Share, Declared $ 0.10 $ 0.00 $ 0.10 $ 0.00
Dividends Payable, Date to be Paid     Aug. 05, 2013  
Stock Repurchase Program, Authorized Amount     $ 269,000,000  
Payments for Repurchase of Common Stock     89,940,000 961,000
Share repurchase plan [Member]
        
Class of Stock [Line Items]        
Stock Repurchase Program, Authorized Amount 352,300,000      
Stock repurchases, shares 5,300      
Payments for Repurchase of Common Stock 83,000,000      
Shares withheld to pay taxes [Member]
        
Class of Stock [Line Items]        
Payments for Repurchase of Common Stock     $ 6,900,000 $ 1,000,000
Subsequent Event [Member]
        
Class of Stock [Line Items]        
Dividends Payable, Date to be Paid     Oct. 02, 2013