Balance Sheet Account Details

Short-Term Investments

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



	March 30, 2014									December 29, 2013
	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	$	81,077	$	26	$	(78	)	$	81,025	$	82,226	$	18	$	(101	)	$	82,143
Corporate debt securities	427,130		284		(427		)	426,987		342,034		312		(376		)	341,970
U.S. Treasury securities	65,211		70		(4		)	65,277		29,795		58		—			29,853
Total available-for-sale securities	$	573,418	$	380	$	(509	)	$	573,289	$	454,055	$	388	$	(477	)	$	453,966

As of March 30, 2014, the Company had 118 available-for-sale securities in a gross unrealized loss position which had been in such position for less than twelve months. There were no impairments considered other-than-temporary as it is more likely than not the Company will hold the securities until maturity or the recovery of the cost basis. The following table shows the fair values and the gross unrealized losses of such available-for-sale securities that were in an unrealized loss position for less than twelve months as of March 30, 2014 and December 29, 2013, aggregated by investment category (in thousands):



	March 30, 2014					December 29, 2013
	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
Debt securities in government sponsored entities	$	53,076	$	(78	)	$	73,362	$	(101	)
Corporate debt securities	197,841		(398		)	168,118		(373		)
U.S. Treasury securities	15,117		(4		)	—		—
Total	$	266,034	$	(480	)	$	241,480	$	(474	)

Realized gains and losses are determined based on the specific identification method and are reported in interest income.

Contractual maturities of available-for-sale debt securities as of March 30, 2014 were as follows (in thousands):



	Estimated Fair Value
Due within one year	$	204,870
After one but within five years	368,419
Total	$	573,289

Cost-Method Investments

As of March 30, 2014 and December 29, 2013, the aggregate carrying amounts of the Company’s cost-method investments in non-publicly traded companies were $26.7 million and $22.1 million, respectively, which were included in other assets. During the three months ended March 31, 2013, the Company sold a cost-method investment and recognized a $6.1 million gain. The Company’s cost-method investments are assessed for impairment quarterly. No impairment loss was recorded during the three months ended March 30, 2014 or March 31, 2013. 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.

Headquarter Facility Exit Obligation

Changes in the Company’s facility exit obligation related to its former headquarters lease during the three months ended March 30, 2014 and March 31, 2013 are as follows (in thousands):



	Three Months Ended
	March 30, 2014			March 31, 2013
Balance at beginning of period	$	38,218		$	45,352
Additional facility exit obligation accrued	—			286
Accretion of interest expense	595			471
Cash payments	(1,633		)	(2,201		)
Balance at end of period	$	37,180		$	43,908

Warranties

Changes in the Company’s reserve for product warranties during the three months ended March 30, 2014 and March 31, 2013 are as follows (in thousands):



	Three Months Ended
	March 30, 2014			March 31, 2013
Balance at beginning of period	$	10,407		$	10,136
Additions charged to cost of revenue	4,192			5,421
Repairs and replacements	(3,107		)	(4,751		)
Balance at end of period	$	11,492		$	10,806

Inventory

Inventory consists of the following (in thousands):



	March 30, 2014		December 29, 2013
Raw materials	$	56,798	$	57,398
Work in process	78,742		70,016
Finished goods	28,691		26,685
Total inventory	$	164,231	$	154,099

Goodwill

Changes in the Company’s goodwill balance during the three months ended March 30, 2014 are as follows (in thousands):



	Goodwill
Balance as of December 29, 2013	$	723,061
Purchase price allocation adjustments related to a prior year acquisition	198
Balance as of March 30, 2014	$	723,259

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):



	March 30, 2014		December 29, 2013
Accrued compensation expenses	$	66,623	$	82,705
Deferred revenue, current portion	59,535		50,834
Accrued taxes payable	30,644		30,435
Customer deposits	14,312		13,569
Reserve for product warranties	11,492		10,407
Acquisition related contingent liability, current portion	6,950		6,719
Facility exit obligation, current portion	6,102		5,570
Other	19,634		18,881
Total accrued liabilities	$	215,292	$	219,120