Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Stock-Based Compensation [Abstract]

Schedule Of Assumptions Used To Estimate Fair Value Of Stock Options

	For the year ended December 31,
	2013	2012	2011
Risk free interest rate	0.51% - 1.38%	0.58% - 0.83%	0.66% - 2.17%
Dividend yield	0.0%	0.0%	0.0%
Expected volatility	25.0% - 29.0%	53.0%	53.9%
Expected lives	3.9 - 4.8 years	3.8 - 4.6 years	3.5 - 4.5 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, 2010	3,786	$	24.78
Granted	578	$	41.91
Exercised	(704)	$	21.53
Canceled	(52)	$	32.07
Outstanding at December 31, 2011	3,608	$	28.06
Granted	613	$	47.58
Exercised	(1,381)	$	24.37
Canceled	(9)	$	37.71
Outstanding at December 31, 2012	2,831	$	34.06
Granted	984	$	73.17
Exercised	(776)	$	27.57
Canceled	(60)	$	52.54
Outstanding at December 31, 2013	2,979	$	48.30	4.3	$	123,769
Exercisable at December 31, 2013	1,194	$	31.17	2.6	$	70,033
Unvested at December 31, 2013	1,785	$	59.74	5.5	$	53,736

Additional Information Regarding Options Outstanding And Exercisable

	Options Outstanding				Options Exercisable
			Weighted			Weighted
		Weighted Average	Average			Average
Range	Outstanding	Contractual Life	Exercise Price		Exercisable	Exercise Price
	(in thousands)	(in years)			(in thousands)
$0.00 - $10.50	9	1.1	$	8.56	9	$	8.56
$10.51 - $21.00	340	2.1	$	19.41	340	$	19.41
$21.01 - $31.50	104	3.0	$	27.53	95	$	27.39
$31.51 - $60.00	1,560	3.8	$	40.81	750	$	37.26
$60.01 - $79.67	966	6.2	$	73.17	—	$	0.00
	2,979				1,194

Activity Of Options Outstanding Not Yet Vested

		Weighted-
		Average
	Number	Fair Value
	of Shares	Per Share
	(in thousands)
Unvested as of December 31, 2012	1,526	$	17.20
Shares granted	984	$	17.38
Vesting during period	(665)	$	14.79
Forfeited or canceled	(60)	$	18.52
Unvested as of December 31, 2013	1,785	$	18.15

Company's Restricted Stock Unit Activity

		Weighted-
		Average
		Grant Date
	Number of	Fair Value per
	Units	Share
	(in thousands)
Outstanding at December 31, 2012	294	$	43.27
Granted	122	$	73.44
Vested	(100)	$	41.82
Forfeited/canceled	(11)	$	49.03
Outstanding at December 31, 2013	305	$	55.60
Expected to vest, net of estimated forfeitures
as of December 31, 2013	303	$	55.69

Schedule Of Non-Cash Compensation Expense

		For the year ended December 31,
	2013		2012		2011
	(in thousands)
Cost of revenues	$	230	$	187	$	187
Selling, general and administrative		16,975		13,781		11,282
Total cost of non-cash compensation included
in loss before provision for income taxes		17,205		13,968		11,469
Amount of income tax recognized in earnings		—		—		—
Amount charged against loss	$	17,205	$	13,968	$	11,469