Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Stock-Based Compensation [Abstract]

Schedule Of Assumptions Used To Estimate Fair Value Of Stock Options

	For the nine months ended
	September 30,
	2014	2013
Risk free interest rate	1.15% - 1.37%	0.51% - 1.38%
Dividend yield	0.0%	0.0%
Expected volatility	22.0%	25.0% - 29.0%
Expected lives	4.4 years	3.9 - 4.8 years

Company's Activities With Respect To Its Stock Options

				Weighted-
		Weighted-		Average
		Average		Remaining
	Number	Exercise Price		Contractual	Aggregate
	of Shares	Per Share		Life (in years)	Intrinsic Value
Outstanding at December 31, 2013	2,979	$	48.30
Granted	1,121	$	95.51
Exercised	(743)	$	36.20
Canceled	(29)	$	77.89
Outstanding at September 30, 2014	3,328	$	66.64	4.9	$	147,296
Exercisable at September 30, 2014	1,082	$	41.08	3.2	$	75,516
Unvested at September 30, 2014	2,246	$	78.95	5.7	$	71,780

Company's Restricted Stock Unit Activity

		Weighted-
		Average
		Grant Date
	Number of	Fair Value per
	Units	Share
	(in thousands)
Outstanding at December 31, 2013	305	$	55.60
Granted	118	$	95.55
Vested	(121)	$	50.14
Forfeited/canceled	(3)	$	74.31
Outstanding at September 30, 2014	299	$	73.42