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Stock-Based Compensation Plans (Details) - Employee Stock Option [Member]
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at beginning of year | shares 1,351,826
Shares, Exercised | shares (18,950)
Shares, Forfeited or expired | shares (7,050)
Shares, Outstanding at end of year | shares 1,325,826
Shares, Exercisable at end of year | shares 577,806
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ / shares $ 26.09
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares 23.92
Weighted Average Exercise Price, Forfeited or expired (in dollars per share) | $ / shares 26.63
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | $ / shares 26.12
Weighted Average Exercise Price, Exercisable at end of year (in dollars per share) | $ / shares $ 25.61
Weighted Average Remaining Contractual Term (Years), Outstanding - June 30, 2016 3 years 7 months 6 days
Weighted Average Remaining Contractual Term (Years), Exercisable - June 30, 2016 2 years 7 months 6 days
Aggregate Intrinsic Value,Outstanding at June 30, 2016 | $ $ 2,425,000 [1]
Aggregate Intrinsic Value, Exercisable at June 30, 2016 | $ $ 1,369,000 [1]
[1] The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the closing price of the Company's stock on June 30, 2016, the last trading day of the quarter, of $27.78 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.