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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, 2015
$ / 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 409,482
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 5 years 8 months 19 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 22.59
Number of Shares Outstanding, Exercisable Options, in shares | shares 275,401
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 4 years 6 months 7 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 21.68
Exercise Price Range $18.71 to $19.48 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 65,112
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 2 years 8 months 27 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 18.89
Number of Shares Outstanding, Exercisable Options, in shares | shares 65,112
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 2 years 8 months 27 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 18.89
Exercise Price Range $20.82 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 13,150
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 11 months 1 day
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 20.41
Number of Shares Outstanding, Exercisable Options, in shares | shares 13,150
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 11 months 1 day
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 20.41
Exercise Price Range $21.83 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 134,458
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 4 years 9 months 11 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 22.21
Number of Shares Outstanding, Exercisable Options, in shares | shares 129,679
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 4 years 8 months 9 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 22.19
Exercise Price Range $23.30 to $23.95 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 67,565
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 6 years 26 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 23.48
Number of Shares Outstanding, Exercisable Options, in shares | shares 49,747
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 6 years 26 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 23.48
Exercise Price Range $24.51 to $25.27 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 129,197
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 8 years 6 months 4 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 24.60
Number of Shares Outstanding, Exercisable Options, in shares | shares 17,713
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 8 years 29 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 24.03