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Stock Based Compensation Stock Based Compensation Option Awards Granted (Details) - 4/3/2018 - Two Thousand Ten Nonemployee Director Stock Plan [Member] - Employee Stock Option [Member]
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 5,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 21 months [1]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date Apr. 03, 2028
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 21.15%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 1.94%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.62%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 13.46
[1] Vesting period began on the grant date.