Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_AccruedLiabilitiesCurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Balance Sheet Information (Details 4) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Sep. 28, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Intangible Assets
Gross intangible assets			$ 128,883	$ 128,883
Less accumulated amortization			(107,909)	(103,001)
Intangible assets, net			20,974	25,882
Estimated aggregate amortization expense
2013			3,556
2014			2,919
2015			2,752
2016			2,530
2017			1,544
Cost Method Investment
Cost method investments	3,000	1,600	10,341
Percentage ownership of preferred shares			15.30%
Percentage ownership of cost method investee			12.00%
Accrued Expenses and Other Current Liabilities
Payroll and related benefits			14,581	19,017
Sales, use and other taxes			6,480	6,315
Customer deposits			32,719	57,075
Warranty			4,942	8,731
Restructuring liability			1,875	956	2,279
Other			13,663	14,532
Total			74,260	106,626
Warranty period of products purchased			1 year
Accrued Warranty
Balance as of the beginning of year		4,942	8,731	8,266
Warranties issued during the year			3,563	7,366
Settlements made during the year			(7,060)	(8,462)
Changes in estimate during the period			(292)	1,561
Balance as of the end of year			4,942	8,731
Reclassification from the beginning balance of accrued warranty to accrued installation			1,047	972
Gross
Translation adjustments			7,040	8,111
Defined benefit pension plan			(1,285)	(1,069)
Unrealized gain (loss) on available for sale securities			76	218
Accumulated other comprehensive income			5,831	7,260
Taxes
Translation adjustments			(339)	(1,022)
Defined benefit pension plan			510	431
Unrealized gain (loss) on available for sale securities			(29)	(79)
Accumulated other comprehensive income			142	(670)
Net
Translation adjustments			6,701	7,089
Defined benefit pension plan			(775)	(638)
Unrealized gain (loss) on available for sale securities			47	139
Accumulated other comprehensive income			5,973	6,590
Purchased technology
Intangible Assets
Gross intangible assets			109,248	109,248
Less accumulated amortization			(93,436)	(89,620)
Intangible assets, net			15,812	19,628
Other intangible assets
Intangible Assets
Gross intangible assets			19,635	19,635
Less accumulated amortization			(14,473)	(13,381)
Intangible assets, net			$ 5,162	$ 6,254