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Stock, Stock Options and Rights Employee Stock Purchase Plan (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 59,693    
Employee Stock Purchase Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Purchase Price of Shares of the Lower of Fair Market Value 85.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Look-back Period 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,000    
Common Stock, Capital Shares Reserved for Future Issuance 2,654    
Shares purchased 3,506 1,924 1,824
Employee Stock Purchase Plan [Member] | Maximum [Member] | Alternative 1 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Number of Allocated Shares 3,000    
Employee Stock Purchase Plan [Member] | Maximum [Member] | Alternative 2 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase Percentage of Number of Allocated Shares 1.50%