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Stock-Based Compensation Plans (Details) (Employee Stock Option [Member], USD $)
 6 Months Ended
Jun. 30, 2014
Employee Stock Option [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at December 31, 2013 1,260,866
Shares, Issued 0
Shares, Exercised (31,875)
Shares, Forfeited or expired (4,450)
Shares, Outstanding at June 30, 2014 1,224,541
Shares, Exercisable at June 30, 2014 549,206
Weighted Average Exercise Price, Outstanding at December 31, 2013 $ 24.41
Weighted Average Exercise Price, Issued $ 0
Weighted Average Exercise Price, Exercised $ 19.08
Weighted Average Exercise Price, Forfeited or expired $ 25.55
Weighted Average Exercise Price, Outstanding at June 30, 2014 $ 24.54
Weighted Average Exercise Price, Exercisable at June 30, 2014 $ 22.58
Weighted Average Remaining Contractual Term (Years), Outstanding at June 30, 2014 3 years 3 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at June 30, 2014 1 year 9 months 18 days
Aggregate Intrinsic Value, Outstanding at June 30, 2014 $ 3,870,000 [1]
Aggregate Intrinsic Value, Exercisable at June 30, 2014 $ 2,653,000 [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 June 30, 2014, the last trading day of the quarter, of $27.41 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.