Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Stock-Based Compensation [Abstract]

Schedule Of Assumptions Used To Estimate Fair Value Of Stock Options

	For the six months ended
	June 30,
	2015	2014
Risk free interest rate	1.21% - 1.45%	1.15% - 1.325%
Dividend yield	0.0%	0.0%
Expected volatility	20.0%	22.0%
Expected lives	4.6 years	4.4 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, 2014	3,275	$	66.85
Granted	1,068	$	124.30
Exercised	(307)	$	51.68
Canceled	(28)	$	88.27
Outstanding at June 30, 2015	4,008	$	83.16	4.9	$	137,446
Exercisable at June 30, 2015	1,532	$	54.43	3.4	$	92,772
Unvested at June 30, 2015	2,476	$	100.94	5.8	$	44,674

Company's Restricted Stock Unit Activity

		Weighted-
		Average
		Grant Date
	Number of	Fair Value per
	Units	Share
	(in thousands)
Outstanding at December 31, 2014	295	$	73.55
Granted	110	$	123.99
Vested	(121)	$	64.41
Forfeited/canceled	(2)	$	96.29
Outstanding at June 30, 2015	282	$	96.93