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Stock-Based Compensation Plans (Details) - Employee Stock Option [Member]
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at beginning of year | shares 1,486,257
Granted | shares 211,200
Shares, Exercised | shares (81,464)
Shares, Forfeited or expired | shares (14,175)
Shares, Outstanding at end of year | shares 1,601,818
Shares, Exercisable at end of year | shares 898,106
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ / shares $ 26.13
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares 27.94
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares 24.71
Weighted Average Exercise Price, Forfeited or expired (in dollars per share) | $ / shares 26.46
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | $ / shares 26.44
Weighted Average Exercise Price, Exercisable at end of year (in dollars per share) | $ / shares $ 26.19
Weighted Average Remaining Contractual Life (Years), Outstanding - September 30, 2017 3 years 10 months 24 days
Weighted Average Remaining Contractual Life (Years), Exercisable - September 30, 2017 2 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding at September 30, 2017 | $ $ 3,149,000 [1]
Aggregate Intrinsic Value, Exercisable at September 30, 2017 | $ $ 1,992,000 [1]
[1] The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of the Company's stock on September 29, 2017, the last trading day of the quarter, of $28.38 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.