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Stock Compensation Plans Level 4 Employee Stock Purchase Plan (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 5.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 15,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 4,722,165    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 222,113 249,344 258,609
Weighted Average Per Share Fair Value of Discount $ 2.26 $ 2.15 $ 1.70
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date   5.00%