Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Share-based Compensation [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:

	Six months ended June 30,
	2013			2012
Dividend yield	1.50		%	1.30		%
Volatility - stock option plans	38%			38 - 39%
Risk free interest rates	.71 - 1.15%			0.89 - 1.43%
Expected life (years) - stock option plans	5.91 - 7.43			5.79 - 7.26
Weighted average fair value of stock options granted during the period	$	11.17		$	13.53

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

Total stock compensation expense and the total related tax benefit recognized are as follows:

	Three months ended				Six months ended
	June 30,				June 30,
	2013		2012		2013		2012
Stock compensation expense	$	11,040	$	10,926	$	22,045	$	21,526
Recognized tax benefit	$	900	$	336	$	1,549	$	375