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Stock-Based Compensation Plans Stock Awards
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 38,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 21,089
Stock award  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at end of period 40,000
Exercise price of award | $ / shares $ 10