Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Stock-Based Compensation [Abstract]

Schedule Of Assumptions Used To Estimate Fair Value Of Stock Options

	For the nine months ended
	September 30,
	2015	2014
Risk free interest rate	1.21% - 1.45%	1.15% - 1.37%
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	1,071	$	124.28
Exercised	(416)	$	52.04
Canceled	(55)	$	92.84
Outstanding at September 30, 2015	3,875	$	83.93	4.7	$	101,301
Exercisable at September 30, 2015	1,429	$	54.56	3.2	$	71,696
Unvested at September 30, 2015	2,446	$	101.08	5.6	$	29,605

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	$	123.97
Vested	(122)	$	64.35
Forfeited/canceled	(6)	$	94.25
Outstanding at September 30, 2015	277	$	97.12