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Stock-Based Compensation - Schedule of Grants (Details)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Options Outstanding (in shares) 1,179,199 1,358,717 1,223,159
RSA's (Restricted Stock Awards) outstanding 173,805    
Options and RSA's Exercised 1,128,908    
Available Shares 1,904,033    
Total (in shares) 4,385,945    
2010 ECP
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Options Outstanding (in shares) 605,690    
RSA's (Restricted Stock Awards) outstanding 173,805    
Options and RSA's Exercised 904,744    
Available Shares 1,701,706    
Total (in shares) 3,385,945    
2005 LTIP
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Options Outstanding (in shares) 573,509    
RSA's (Restricted Stock Awards) outstanding 0    
Options and RSA's Exercised 224,164    
Available Shares 202,327    
Total (in shares) 1,000,000