Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Share-Based Compensation [Abstract]

Schedule Of Selected Financial Impact Of Share-Based Compensation

		For the Years Ended December 31,
		2017		2016		2015
Share-based compensation expense included in cost of revenue	$	2,675	$	2,305	$	2,138
Share-based compensation expense included in operating expenses		20,842		17,586		17,746
Total share-based compensation expense included in consolidated statements of income		23,517		19,891		19,884
Income tax benefit resulting from share-based compensation expense		(6,810)		(6,143)		(6,229)
Net share-based compensation expense included in consolidated statements of income, excluding tax benefit from settlement of share-based awards		16,707		13,748		13,655
Income tax benefit resulting from settlement of share-based awards (1)		(27,743)		-		-
Net (benefit) expense related to share-based compensation arrangements included in consolidated statements of income	$	(11,036)	$	13,748	$	13,655

⁽¹⁾ See Note 1(w) for more information regarding the adoption of ASU 2016-09.

Schedule Of Weighted Averages Of The Assumptions Used In Estimating The Fair Value Of Stock Option Awards

	For the Years Ended December 31,
		2017			2016			2015
Share price at grant	$	142.89		$	69.07		$	78.08
Expected stock price volatility		26	%		25	%		23	%
Expected term, in years		5.8			5.7			5.6
Risk-free interest rate		2.0	%		1.2	%		1.5	%
Weighted average fair value of options granted	$	40.83		$	17.87		$	19.72

Schedule Of Stock Option Activity

	Number of Options (000)	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Outstanding as of December 31, 2016	3,176	$	57.31
Granted	384		142.89
Exercised	(716)		42.66
Forfeited	(117)		68.41
Outstanding as of December 31, 2017	2,727	$	72.72	6.0	$	228,243
Fully vested as of December 31, 2017	1,327	$	56.06	4.2	$	133,115
Fully vested and expected to vest as of December 31, 2017	2,649	$	72.45	5.9	$	222,422

Schedule Of Restricted Stock Unit Activity

	Number of Units (000)	Weighted Average Grant-Date Fair Value
Nonvested as of December 31, 2016	468	$	64.88
Granted	97		142.27
Vested	(155)		59.63
Forfeited	(27)		76.56
Nonvested as of December 31, 2017	383	$	85.74
Expected to vest as of December 31, 2017	357	$	85.23