Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2014

Schedule of available-for-sale securities and gains and losses in Accumulated Other Comprehensive Income (Loss)

Total available-for-sale securities and gains and losses in Accumulated Other Comprehensive Income (Loss) consist of the following (in thousands):

	June 30, 2014
	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income			Estimated Fair Value
U.S. treasuries	$	123,672	$	12	$	—		$	123,684
Corporate debt	65,176		111		(2		)	65,285
Government agency securities	63,192		4		—			63,196
Total available-for-sale securities	$	252,040	$	127	$	(2	)	$	252,165

	December 31, 2013
	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income			Estimated Fair Value
U.S. treasuries	$	130,956	$	22	$	(1	)	$	130,977
Corporate debt	77,582		55		(36		)	77,601
Government agency securities	61,004		9		—			61,013
Commercial paper	11,947		—		—			11,947
Total available-for-sale securities	$	281,489	$	86	$	(37	)	$	281,538

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, 2014
	Less than 12 months
	Estimated Fair Value		Gross Unrealized Losses
Corporate debt	$	3,350	$	(2	)
Total	$	3,350	$	(2	)

	December 31, 2013
	Less than 12 months
	Estimated Fair Value		Gross Unrealized Losses
Corporate debt	$	37,654	$	(36	)
U. S. treasuries	29,068		(1		)
Total	$	66,722	$	(37	)

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, 2014
	Estimated Fair Value
Due in one year or less	$	212,814
Due in 1—2 years	39,351
Total available-for-sale securities	$	252,165

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,
	2014		2013
Materials	$	29,034	$	34,301
Work in process	12,736		12,900
Finished goods	6,594		12,525
	$	48,364	$	59,726

Schedule of changes in goodwill

Changes in our goodwill are as follows (in thousands):

Beginning balance as of December 31, 2013	$	91,348
Purchase price adjustment (see Business Combinations)	173
Ending balance as of June 30, 2014	$	91,521

Schedule of changes in warranty liability

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

	June 30,
	2014			2013
Balance as of the beginning of period	$	5,662		$	4,942
Warranties issued during the period	1,653			1,806
Settlements made during the period	(1,963		)	(2,540		)
Changes in estimate during the period	279			—
Balance as of the end of period	$	5,631		$	4,208

Schedule of the components of accumulated other comprehensive income

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

	Gross			Taxes			Net
As of June 30, 2014
Translation adjustments	$	5,827		$	(392	)	$	5,435
Minimum pension liability	(1,160		)	424			(736		)
Unrealized gain on available-for-sale securities	125			(18		)	107
Accumulated other comprehensive income	$	4,792		$	14		$	4,806

	Gross			Taxes			Net
As of December 31, 2013
Translation adjustments	$	5,718		$	(392	)	$	5,326
Minimum pension liability	(1,160		)	424			(736		)
Unrealized gain on available-for-sale securities	49			(18		)	31
Accumulated other comprehensive income	$	4,607		$	14		$	4,621

Summary of share activities impacting common stock and additional paid-in capital balances

Summary share activities impacting our common stock and additional paid-in capital balances are as follows (in thousands):

	For the Six Months Ended June 30, 2014
	Shares
Restricted Stock
Grants	206

Gross Vesting	168
Shares Withheld to Cover Taxes & Cancelled	(55	)
Net Shares Vested	113

Stock Options
Exercised	384