Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Stock-Based Compensation [Abstract]

Schedule Of Assumptions Used To Estimate Fair Value Of Stock Options

	For the three months ended
	March 31,
	2015	2014
Risk free interest rate	1.31% - 1.45%	1.15%
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	3,276	$	66.85
Granted	1,038	$	124.56
Exercised	(217)	$	46.91
Canceled	(12)	$	102.71
Outstanding at March 31, 2015	4,085	$	82.53	5.1	$	148,878
Exercisable at March 31, 2015	1,591	$	54.58	3.7	$	99,482
Unvested at March 31, 2015	2,494	$	100.38	6.0	$	49,396

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	104	$	124.56
Vested	(112)	$	64.01
Forfeited/canceled	(1)	$	102.59
Outstanding at March 31, 2015	286	$	95.60