Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2013

Schedule of available-for-sale securities

Available-for-sale securities consist of the following (in thousands):

	June 30, 2013
	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income			Estimated Fair Value
United States treasuries	$	196,063	$	27	$	(28	)	$	196,062
Corporate bonds	75,837		4		(213		)	75,628
Goverment agency securities	64,647		8		(13		)	64,642
Commercial paper	4,000		—		—			4,000
Total available-for-sale securities	$	340,547	$	39	$	(254	)	$	340,332

	December 31, 2012
	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income		Estimated Fair Value
United States treasuries	$	184,102	$	76	$	—	$	184,178
Government agency securities	8,056		—		—		8,056
Total available-for-sale securities	$	192,158	$	76	$	—	$	192,234

Summary of fair value of short-term investments that have been in an unrealized loss position for less than 12 months

The table below shows the fair value of short-term investments that have been in an unrealized loss position for less than 12 months (in thousands):

	June 30, 2013
	Less than 12 months					Total
	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
Corporate bonds	$	66,351	$	(213	)	$	66,351	$	(213	)
United States treasuries	44,881		(28		)	44,881		(28		)
Government agency securities	7,987		(13		)	7,987		(13		)
Total	$	119,219	$	(254	)	$	119,219	$	(254	)

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

Contractual maturities of available-for-sale debt securities are as follows (in thousands):

		June 30, 2013
	Estimated Fair Value
Due in one year or less		$	247,937
Due in 1—2 years		32,271
Due in 2—3 years		60,124
Total available-for-sale securities		$	340,332

Schedule of inventories

Inventories are stated at the lower of cost (principally first-in, first-out) or market. Inventories consist of (in thousands):

	June 30,		December 31,
	2013		2012
Materials	$	36,499	$	36,523
Work in process	19,815		13,363
Finished goods	7,793		9,921
	$	64,107	$	59,807

Schedule of changes in warranty liability

Changes in our warranty liability during the period are as follows (in thousands):

	June 30,
	2013			2012
Balance as of the beginning of period	$	4,942		$	8,731
Warranties issued during the period	1,806			1,547
Settlements made during the period	(2,540		)	(3,625		)
Changes in estimate during the period	—			25
Balance as of the end of period	$	4,208		$	6,678

Schedule of the components of accumulated other comprehensive income

The components of accumulated other comprehensive income are (in thousands):

As of June 30, 2013	Gross			Taxes			Net
Translation adjustments	$	5,967		$	(528	)	$	5,439
Minimum pension liability	(1,285		)	510			(775		)
Unrealized loss on available-for-sale securities	(215		)	50			(165		)
Accumulated other comprehensive income	$	4,467		$	32		$	4,499

As of December 31, 2012	Gross			Taxes			Net
Translation adjustments	$	7,040		$	(339	)	$	6,701
Minimum pension liability	(1,285		)	510			(775		)
Unrealized gain on available-for-sale securities	76			(29		)	47
Accumulated other comprehensive income	$	5,831		$	142		$	5,973