Summary Of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2011

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Assets And Liabilities Measured At Fair Value On Recurring Basis

	Fair value measurements as of September 30, 2011
	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	107,397	$	107,397	$	0	$	0
Short-term investments		338,429		338,429		0		0
Restricted cash		15,000		15,000		0		0
Deferred compensation plan assets		7,393		7,393		0		0
	$	468,219	$	468,219	$	0	$	0
Liabilities:
Deferred compensation plan liabilities	$	7,393	$	7,393	$	0	$	0
	$	7,393	$	7,393	$	0	$	0

Schedule Of Antidilutive Instruments Excluded From Calculation Of Basic And Diluted Earnings Per Share

	Three months ended September 30,				Nine months ended September 30,
	2011		2010		2011		2010
Antidilutive options and awards to purchase common stock		331		1,798		429		1,656
Antidilutive shares underlying convertible senior notes		9,416		15,238		11,655		15,238
		9,747		17,036		12,084		16,894

Schedule Of Estimated Stock-Based Compensation

	Three months ended September 30,				Nine months ended September 30,
	2011		2010		2011		2010
Selling, general and administrative expenses	$	4,983	$	4,606	$	15,762	$	18,027
Research and development expenses		2,427		2,424		7,515		9,207
	$	7,410	$	7,030	$	23,277	$	27,234

Schedule Of Non-Cash ESOP and 401(k) Expense By Operating Statement Classification

	Three months ended September 30,				Nine months ended September 30,
	2011		2010		2011		2010
Selling, general and administrative expenses	$	2,569	$	2,403	$	7,633	$	8,860
Research and development expenses		1,764		1,618		5,282		6,771
	$	4,333	$	4,021	$	12,915	$	15,631