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Stock-Based Compensation Plans (Details) - Employee Stock Option [Member]
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at beginning of year | shares 1,502,493
Shares, Granted | shares 129,200
Shares, Exercised | shares (412,014)
Shares, Forfeited or expired | shares (27,576)
Shares, Outstanding at end of year | shares 1,192,103
Shares, Exercisable at end of year | shares 709,040
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ / shares $ 26.57
Weighted Average Exercise Price,Granted (in dollars per share) | $ / shares 37.22
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares 25.94
Weighted Average Exercise Price, Forfeited or expired (in dollars per share) | $ / shares 26.36
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | $ / shares 27.93
Weighted Average Exercise Price, Exercisable at end of year (in dollars per share) | $ / shares $ 26.89
Weighted Average Remaining Contractual Life (Years), Outstanding - September 30, 2018 4 years 4 months 24 days
Weighted Average Remaining Contractual Life (Years), Exercisable - September 30, 2018 2 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding at September 30, 2018 | $ $ 8,903,000 [1]
Aggregate Intrinsic Value, Exercisable at September 30, 2018 | $ $ 5,880,000 [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 28, 2018, the last trading day of the quarter, of $35.18 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.