v2.4.0.6
Stock-Based Compensation Plans (Details) (Stock Options [Member], USD $)
3 Months Ended
Mar. 31, 2013
Stock Options [Member]
 
Shares, Outstanding at December 31, 2012 1,265,792
Shares, Exercised (148,626)
Shares, Forfeited or expired (700)
Shares, Outstanding at March 31, 2013 1,116,466
Shares, Exercisable at March 31, 2013 557,837
Weighted Average Exercise Price, Outstanding at December 31, 2012 $ 22.76
Weighted Average Exercise Price,Exercised $ 16.81
Weighted Average Exercise Price, Forfeited or expired $ 24.27
Weighted Average Exercise Price, Outstanding at March 31, 2013 $ 23.55
Weighted Average Exercise Price, Exercisable at March 31, 2013 $ 23.24
Weighted Average Remaining Contractual Term (Years), Outstanding at March 31, 2013 3 years 3 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at March 31, 2013 1 year 10 months 24 days
Aggregate Intrinsic Value, Outstanding at March 31, 2013 $ 1,760,000 [1]
Aggregate Intrinsic Value, Exercisable at March 31, 2013 $ 1,398,000 [1]
[1] The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value at March 28, 2013, the last trading day of the quarter, of $24.51 and the exercise price.