Balance Sheet Account Details

Short-Term Investments

The following is a summary of short-term investments (in thousands):



	April 1, 2012									January 1, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale securities:
Debt securities in government sponsored entities	$	402,474	$	441	$	(216	)	$	402,699	$	393,759	$	428	$	(148	)	$	394,039
Corporate debt securities	504,116		1,692		(379		)	505,429		432,550		1,293		(461		)	433,382
U.S. Treasury securities	98,020		111		(90		)	98,041		58,955		214		—			59,169
Total available-for-sale securities	$	1,004,610	$	2,244	$	(685	)	$	1,006,169	$	885,264	$	1,935	$	(609	)	$	886,590

As of April 1, 2012, the Company had 121 available-for-sale securities in a gross unrealized loss position, all of which had been in such position for less than twelve months except for one security with a fair value of $2.0 million and an immaterial gross unrealized loss as of April 1, 2012. There were no impairments considered other-than-temporary as it is more likely than not the Company will hold the securities until maturity or until the cost basis is recovered.

The following table shows the fair values and the gross unrealized losses of the Company’s available-for-sale securities that were in an unrealized loss position for less than twelve months as of April 1, 2012 and January 1, 2012 aggregated by investment category (in thousands):



	April 1, 2012					January 1, 2012
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Debt securities in government sponsored entities	$	144,029	$	(216	)	$	133,904	$	(148	)
Corporate debt securities	156,430		(378		)	138,326		(461		)
U.S. Treasury securities	62,444		(90		)	—		—
Total	$	362,903	$	(684	)	$	272,230	$	(609	)

Realized gains and losses are determined based on the specific identification method and are reported in interest income in the consolidated statements of income. Gross realized gains and losses on sales of available-for-sale securities for the three months ended April 1, 2012 and April 3, 2011 were immaterial.

Contractual maturities of available-for-sale debt securities as of April 1, 2012 were as follows (in thousands):



	Estimated Fair Value
Due within one year	$	346,009
After one but within five years	660,160
Total	$	1,006,169

Cost-Method Investments

As of April 1, 2012 and January 1, 2012, the aggregate carrying amounts of the Company’s cost-method investments in non-publicly traded companies were $52.8 million and $45.3 million, respectively, which were included in other long-term assets in the consolidated balance sheets. The Company assesses all cost-method investments for impairment quarterly. No impairment loss was recorded during the three months ended April 1, 2012 or April 3, 2011. The Company does not reassess the fair value of cost-method investments if there are no identified events or changes in circumstances that may have a significant adverse effect on the fair value of the investments.

Inventory

Inventory, net, consists of the following (in thousands):



	April 1, 2012		January 1, 2012
Raw materials	$	55,386	$	58,340
Work in process	55,599		53,412
Finished goods	17,699		17,029
Total inventory, net	$	128,684	$	128,781

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):



	April 1, 2012		January 1, 2012
Deferred revenue, current portion	$	59,572	$	52,573
Accrued compensation expenses	41,759		52,035
Accrued taxes payable	23,336		19,339
Customer deposits	19,362		17,958
Reserve for product warranties	11,871		11,966
Deferred rent, current portion	8,943		11,042
Acquisition related contingent consideration liability, current portion	8,375		2,335
Facility exit obligation, current portion	4,389		4,408
Accrued unsolicited tender offer related expenses	3,165		—
Accrued royalties	2,757		5,682
Other accrued expenses	14,511		10,436
Total accrued liabilities	$	198,040	$	187,774