Restructuring Charges (Details) (USD $)	3 Months Ended		12 Months Ended					3 Months Ended	12 Months Ended		3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended					3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Employee separation costs	Dec. 31, 2013 Restructuring Plan 2013	Jun. 30, 2013 Restructuring Plan 2013 Employee separation costs item	Dec. 31, 2013 Restructuring Plan 2013 Employee separation costs	Dec. 31, 2013 Restructuring Plan 2013 Consolidation of leased facilities	Jun. 30, 2013 Restructuring Plan 2012	Dec. 31, 2012 Restructuring Plan 2012	Dec. 31, 2012 Restructuring Plan 2012 Employee separation costs	Dec. 31, 2013 Restructuring Plan 2012 Employee separation costs	Jun. 30, 2013 Restructuring Plan 2011	Dec. 31, 2013 Restructuring Plan 2011	Dec. 31, 2011 Restructuring Plan 2011	Dec. 31, 2013 Restructuring Plan 2011 Employee separation costs	Dec. 31, 2013 Restructuring Plan 2011 Consolidation of leased facilities	Dec. 31, 2013 Restructuring Plan 2010 Consolidation of leased facilities	Dec. 31, 2010 Restructuring Plan 2010 U.S. Operations
Restructuring Charges.
Number of employees terminated								40
Restructuring charges	$ (75,000)	$ 9,499,000	$ (75,000)	$ 9,499,000	$ 24,432,000	$ 9,500,000	$ 1,552,000		$ 1,452,000	$ 100,000			$ 9,500,000				$ 24,400,000				$ 2,300,000
Restructuring Charges
Balance at the beginning of the period			12,295,000											6,908,000		3,215,000		117,000	3,098,000	2,172,000
Adjustment for sub-lease																(700,000)			(700,000)
Utilized - cash							(915,000)		(915,000)					(5,087,000)		(843,000)		(12,000)	(831,000)	(388,000)
Acceleration of share-based compensation in additional paid-in capital							(357,000)		(357,000)
Other							55,000		55,000					(1,746,000)		(98,000)		(98,000)
Balance at the end of the period		12,295,000	3,768,000	12,295,000			335,000		235,000	100,000			6,908,000	75,000		1,574,000		7,000	1,567,000	1,784,000
Restructuring charges also triggered the recognition of associated with the anticipated withdrawal from Israel	1,600,000
Estimated related cost savings due to restructuring plan												20,000,000
Amount of expense reversed											$ 800,000				$ 700,000