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Stock-Based Compensation Plans (Disclosures by Compensation Plans) (Details) - shares
12 Months Ended
Dec. 31, 2015
Jun. 22, 2014
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted during period 0    
Plan 2010      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to issue under share based compensation plans     8,700,000
Common stock available under stock option plan 4,172,064    
Plan 2004      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Expired   827,835