Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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,
	2014			2013
Dividend yield	1.50		%	1.50		%
Volatility - stock option plans	36		%	38		%
Risk free interest rates	2.27		%	0.71 - 1.15%
Expected life (years) - stock option plans	6.52 - 7.43			5.91 - 7.43
Weighted average fair value of stock options granted during the period	$	14.08		$	11.17

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,
	2014		2013		2014		2013
Stock compensation expense	$	11,877	$	11,040	$	22,171	$	22,045
Recognized tax benefit	$	1,183	$	900	$	2,126	$	1,549