Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2011

Balance Sheet Information

Schedule of available-for-sale securities

	June 30, 2011
	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income		Estimated Fair Value
Commercial paper	$	102,850	$	26	$	—	$	102,876
FDIC insured corporate bonds	127,856		217		—		128,073
Treasury bills	149,484		73		—		149,557
Total available-for-sale securities	$	380,190	$	316	$	—	$	380,506

	December 31, 2010
	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income		Estimated Fair Value
Commercial paper	$	128,527	$	61	$	—	$	128,588
FDIC insured corporate bonds	129,353		24		—		129,377
Treasury bills	136,203		12		—		136,215
Total available-for-sale securities	$	394,083	$	97	$	—	$	394,180

Schedule of contractual maturities of available-for-sale debt securities

Contractual maturities of available-for-sale debt securities at June 30, 2011, are as follows (in thousands):

	Estimated Fair Value
Due in one year or less	$	146,462
Due in 1—2 years	234,044
Total investments in debt securities	$	380,506

Schedule of inventories

	June 30,		December 31,
	2011		2010
Raw materials	$	54,127	$	49,953
Work in process	28,315		33,181
Finished goods	30,897		25,353
	$	113,339	$	108,487

Schedule of changes in goodwill

	Six months ended		Year ended
	June 30,		December 31,
	2011		2010
Beginning Balance	$	52,003	$	52,003
Business Acquired (see Note 2)	15,104		—
Ending Balance	$	67,107	$	52,003

Schedule of changes in warranty liability

	Six months ended
	June 30,
	2011			2010
Balance as of the beginning of period	$	9,238		$	6,675
Warranties issued during the period	5,843			5,085
Settlements made during the period	(4,489		)	(3,241		)
Balance as of the end of period	$	10,592		$	8,519