Acquisition Integration and Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended											3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Americas [Member]	Sep. 30, 2011 Americas [Member]	Sep. 30, 2012 Europe [Member]	Sep. 30, 2011 Europe [Member]	Sep. 30, 2012 Asia Pacific [Member]	Sep. 30, 2011 Asia Pacific [Member]	Sep. 30, 2012 Corporate [Member]	Sep. 30, 2011 Corporate [Member]	Sep. 30, 2012 Employee Terminations [Member]	Sep. 30, 2012 Actions Initiated in 2008 [Member]	Jun. 30, 2012 Actions Initiated in 2008 [Member]	Mar. 31, 2012 Actions Initiated in 2008 [Member]	Sep. 30, 2012 Actions Initiated in 2008 [Member] Employee Terminations [Member]	Jun. 30, 2012 Actions Initiated in 2008 [Member] Employee Terminations [Member]	Mar. 31, 2012 Actions Initiated in 2008 [Member] Employee Terminations [Member]	Sep. 30, 2012 Actions Initiated in 2008 [Member] Lease Obligations [Member]	Jun. 30, 2012 Actions Initiated in 2008 [Member] Lease Obligations [Member]	Mar. 31, 2012 Actions Initiated in 2008 [Member] Lease Obligations [Member]	Sep. 30, 2012 Actions Initiated in 2010 [Member]	Jun. 30, 2012 Actions Initiated in 2010 [Member]	Mar. 31, 2012 Actions Initiated in 2010 [Member]	Sep. 30, 2012 Actions Initiated in 2010 [Member] Employee Terminations [Member]	Jun. 30, 2012 Actions Initiated in 2010 [Member] Employee Terminations [Member]	Mar. 31, 2012 Actions Initiated in 2010 [Member] Employee Terminations [Member]	Sep. 30, 2012 Actions Initiated in 2010 [Member] Lease Obligations [Member]	Jun. 30, 2012 Actions Initiated in 2010 [Member] Lease Obligations [Member]	Mar. 31, 2012 Actions Initiated in 2010 [Member] Lease Obligations [Member]	Sep. 30, 2012 Actions Initiated in 2011 [Member]	Jun. 30, 2012 Actions Initiated in 2011 [Member]	Mar. 31, 2012 Actions Initiated in 2011 [Member]	Sep. 30, 2012 Actions Initiated in 2011 [Member] Employee Terminations [Member]	Jun. 30, 2012 Actions Initiated in 2011 [Member] Employee Terminations [Member]	Mar. 31, 2012 Actions Initiated in 2011 [Member] Employee Terminations [Member]	Sep. 30, 2012 Actions Initiated in 2011 [Member] Lease Obligations [Member]	Jun. 30, 2012 Actions Initiated in 2011 [Member] Lease Obligations [Member]	Mar. 31, 2012 Actions Initiated in 2011 [Member] Lease Obligations [Member]	Sep. 30, 2012 Actions Initiated In 2012 [Member]	Jun. 30, 2012 Actions Initiated In 2012 [Member]	Mar. 31, 2012 Actions Initiated In 2012 [Member]	Sep. 30, 2012 Actions Initiated In 2012 [Member] Employee Terminations [Member]	Jun. 30, 2012 Actions Initiated In 2012 [Member] Employee Terminations [Member]	Mar. 31, 2012 Actions Initiated In 2012 [Member] Employee Terminations [Member]	Sep. 30, 2012 Actions Initiated In 2012 [Member] Lease Obligations [Member]	Jun. 30, 2012 Actions Initiated In 2012 [Member] Lease Obligations [Member]	Mar. 31, 2012 Actions Initiated In 2012 [Member] Lease Obligations [Member]	Sep. 30, 2012 Accrued expenses [Member]	Sep. 30, 2012 Other long-term liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve remaining balance	$ 6,413		$ 6,413											$ 2,926	$ 2,952	$ 3,022	$ 0	$ 0	$ 0	$ 2,926	$ 2,952	$ 3,022	$ 394	$ 394	$ 403	$ 394	$ 394	$ 403	$ 0	$ 0	$ 0	$ 15	$ 15	$ 15	$ 15	$ 15	$ 15	$ 0	$ 0	$ 0	$ 3,078	$ 2,880	$ 277	$ 2,033	$ 1,575	$ 242	$ 1,045	$ 1,305	$ 35
Restructuring reserve included in Accrued expenses																																																		4,486
Restructuring reserve included in Other long term liabilities																																																			1,927
Summary of cost reduction and restructuring actions [Roll Forward]
Beginning of Period														2,952	3,022	2,789	0	0	0	2,952	3,022	2,789	394	403	408	394	403	408	0	0	0	15	15	125	15	15	125	0	0	0	2,880	277	0	1,575	242	0	1,305	35	0
New accruals																																									862	2,982	573	862	1,608	538	0	1,374	35
Adjustments														58	60	420	0	0	0	58	60	420	0	0	10	0	0	10	0	0	0	0	0	(7)	0	0	(7)	0	0	0	79	(38)	13	56	(51)	13	23	13	0
Cash payments														(84)	(130)	(187)	0	0	0	(84)	(130)	(187)	0	(9)	(15)	0	(9)	(15)	0	0	0	0	0	(103)	0	0	(103)	0	0	0	(743)	(341)	(309)	(460)	(224)	(309)	(283)	(117)	0
End of Period	6,413		6,413											2,926	2,952	3,022	0	0	0	2,926	2,952	3,022	394	394	403	394	394	403	0	0	0	15	15	15	15	15	15	0	0	0	3,078	2,880	277	2,033	1,575	242	1,045	1,305	35
Restructuring and Cost reduction related Cost	999		5,012
Impairment charges and other relocation expenses	219		246
Restructuring charges related to employees termination													10
Reserve reversed due to office consolidation			494
Restructuring charges	1,218	468	4,774	1,590
Expenses related to cost reduction program [Abstract]
Period ended			4,774	1,590	3,913	981	838	534	22	0	1	75
Cumulative since program inception			$ 25,337		$ 15,303		$ 6,931		$ 1,192		$ 1,911