v2.4.0.6
Stock-Based Compensation Plans (Details) (Employee Stock Option [Member], USD $)
3 Months Ended
Mar. 31, 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, Exercised (7,550)
Shares, Forfeited or expired 0
Shares, Outstanding at March 31, 2014 1,253,316
Shares, Exercisable at March 31, 2014 573,531
Weighted Average Exercise Price, Outstanding at December 31, 2013 $ 24.41
Weighted Average Exercise Price, Exercised $ 21.83
Weighted Average Exercise Price, Forfeited or expired $ 0
Weighted Average Exercise Price, Outstanding at March 31, 2014 $ 24.42
Weighted Average Exercise Price, Exercisable at March 31, 2014 $ 22.39
Weighted Average Remaining Contractual Term (Years), Outstanding at March 31, 2014 3 years 6 months
Weighted Average Remaining Contractual Term (Years), Exercisable at March 31, 2014 1 year 10 months 24 days
Aggregate Intrinsic Value, Outstanding at March 31, 2014 $ 3,744,000 [1]
Aggregate Intrinsic Value, Exercisable at March 31, 2014 $ 2,653,000 [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 March 31, 2014, the last trading day of the quarter, of $27.02 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.