Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Stock-Based Compensation [Abstract]

Schedule Of Assumptions Used To Estimate Fair Value Of Stock Options

	For the six months ended
	June 30,
	2014	2013
Risk free interest rate	1.15% - 1.325%	0.51% - 1.03%
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	1,115	$	95.47
Exercised	(571)	$	36.55
Canceled	(23)	$	79.48
Outstanding at June 30, 2014	3,500	$	65.03	5.0	$	130,412
Exercisable at June 30, 2014	1,247	$	40.16	3.2	$	77,482
Unvested at June 30, 2014	2,253	$	78.80	5.9	$	52,930

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	117	$	95.51
Vested	(120)	$	50.11
Forfeited/canceled	(3)	$	76.06
Outstanding at June 30, 2014	299	$	73.25