Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and the Directors Plan for the nine months ended September 30, 2014:

				Weighted		Weighted
				Average		Average		Aggregate
				Exercise		Remaining		Intrinsic value
	Options			Price		Contractual Life		(in thousands)
Outstanding at December 31, 2013		1,232,862		$	24.36		6.1	$	61,530
Granted		81,552			73.20				661
Exercised		(144,210	)		21.11				(8,682	)
Canceled		(3,070	)		52.73				(88	)
Outstanding at September 30, 2014		1,167,134		$	28.10		5.7	$	62,101
Exercisable at September 30, 2014		815,518		$	20.69		4.8	$	49,435

Schedule of Share-Based Fair Value of Each Option Grant Weighted-Average Assumptions

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

	Nine Months Ended
	September 30,
	2014			2013
Dividend yield		0.11	%		0.21	%
Risk-free interest rate		2.19	%		1.38	%
Stock price volatility		33.0	%		43.8	%
Expected life (years)		5.0			5.0

Restricted Stock Activity and Incentive Stock Awards Activity

The following table summarizes the restricted stock and unit activity for the 2011 Plan, the 2000 Plan and the Directors Plan, and incentive stock awards activity for the 2011 Plan and the 2000 Plan with related information for the nine months ended September 30, 2014:

							Weighted
	Restricted			Incentive			Average Grant
	Stock			Stock			Date Fair
	and Units			Awards			Value
Outstanding at December 31, 2013		510,128			1,043,594		$	35.27
Granted		149,136			140,240			61.72
Vested		(218,502	)		(458,536	)		29.83
Adjustment for incentive stock awards expected to vest		-			52,292			39.37
Canceled		(3,970	)		(8,370	)		45.92
Outstanding at September 30, 2014		436,792			769,220		$	44.74