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Stock Based Compensation Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 346,155.000
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 5 years 1 month 10 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price $ 24.12
Number of Shares Outstanding, Exercisable Options, in shares | shares 225,694.000
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 3 years 6 months 15 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price $ 21.61
Exercise Price Range $18.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 27,999
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 1 year 22 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price $ 18.00
Number of Shares Outstanding, Exercisable Options, in shares | shares 27,999
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 1 year 22 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price $ 18.00
Exercise Price Range $20.17 to $21.56 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 85,068
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 2 years 6 months 29 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price $ 20.98
Number of Shares Outstanding, Exercisable Options, in shares | shares 85,068
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 2 years 6 months 29 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price $ 20.98
Exercise Price Range $22.14 to $22.65 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 94,111
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 4 years 5 months 27 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price $ 22.43
Number of Shares Outstanding, Exercisable Options, in shares | shares 79,797
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 4 years 2 months 12 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price $ 22.39
Exercise Price Range $23.89 to $24.37 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 89,536
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 7 years 3 months 7 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price $ 24.15
Number of Shares Outstanding, Exercisable Options, in shares | shares 31,800
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 6 years 5 months 27 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price $ 24.08
Exercise Price Range $36.12 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 49,441
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 9 years 26 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price $ 36.12
Number of Shares Outstanding, Exercisable Options, in shares | shares 1,030
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 9 years 26 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price $ 36.12
Minimum [Member] | Exercise Price Range $20.17 to $21.56 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price 20.17
Minimum [Member] | Exercise Price Range $22.14 to $22.65 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price 22.14
Minimum [Member] | Exercise Price Range $23.89 to $24.37 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price 23.89
Maximum [Member] | Exercise Price Range $20.17 to $21.56 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price 21.56
Maximum [Member] | Exercise Price Range $22.14 to $22.65 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price 22.65
Maximum [Member] | Exercise Price Range $23.89 to $24.37 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price $ 24.37