Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Share-Based Compensation [Abstract]

Schedule Of Selected Financial Impact Of Share-Based Compensation

		For the Years Ended December 31,
		2013			2012			2011
Share-based compensation expense included in cost of revenue	$	1,841		$	1,770		$	1,439
Share-based compensation expense included in operating expenses		14,733			14,152			14,057
Total share-based compensation expense included in consolidated statements of income		16,574			15,922			15,496
Income tax benefit resulting from share-based compensation arrangements		(5,584	)		(5,403	)		(5,245	)
Net impact of share-based compensation on net income	$	10,990		$	10,519		$	10,251

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

	For the Years Ended December 31,
		2013			2012			2011
Expected stock price volatility		32	%		34	%		33	%
Expected term, in years		4.9			4.6			4.8
Risk-free interest rate		1.0	%		0.8	%		2.3	%
Weighted average fair value of options granted	$	27.17		$	26.38		$	24.86

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, 2012	2,667	$	52.50
Granted	386		93.40
Exercised	(837)		40.35
Forfeited	(83)		71.56
Expired	(2)		26.70
Outstanding as of December 31, 2013	2,131	$	63.96	3.7	$	90,381
Fully vested as of December 31, 2013	1,111	$	49.48	2.2	$	63,186
Fully vested and expected to vest as of December 31, 2013	2,072	$	63.42	3.6	$	89,014

Schedule Of Restricted Stock Unit Activity

	Number of Units (000)	Weighted Average Grant-Date Fair Value
Nonvested as of December 31, 2012	385	$	65.07
Granted	115		91.95
Vested	(139)		57.80
Forfeited	(25)		72.42
Nonvested as of December 31, 2013	336	$	76.67
Expected to vest as of December 31, 2013	314	$	76.18