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Shareholders' Equity (Narrative) (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Subsequent event [Line Items]    
Dividends Payable, Date to be Paid Aug. 12, 2013  
Additional stock repurchase authorization amount $ 250,000,000  
Stock Repurchase Program, Authorized Amount 352,300,000  
Stock repurchased under authorized repurchase program 0  
Payments for Repurchase of Common Stock $ 6,447,000 $ 908,000
Subsequent Event [Member] | Common Stock [Member]
   
Subsequent event [Line Items]    
Common Stock, Dividends, Per Share, Declared $ 0.05