Restructuring Costs Schedule of restructuring liabilities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Reserve [Roll Forward]
Balance at December 31, 2011			$ 1,819
Restructuring charges	(144)	0	2,431	0
Cost paid or otherwise settled			(3,112)
Effect of change in exchange rates			(20)
Balance at June 30, 2012	1,118		1,118
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance at December 31, 2011			800
Restructuring charges			447
Cost paid or otherwise settled			(902)
Effect of change in exchange rates			(20)
Balance at June 30, 2012	325		325
Property and Equipment Impairments [Member]
Restructuring Reserve [Roll Forward]
Balance at December 31, 2011			0
Restructuring charges			512
Cost paid or otherwise settled			(512)
Effect of change in exchange rates			0
Balance at June 30, 2012	0		0
Facility Closure Costs [Member]
Restructuring Reserve [Roll Forward]
Balance at December 31, 2011			1,019
Restructuring charges			1,472
Cost paid or otherwise settled			(1,698)
Effect of change in exchange rates			0
Balance at June 30, 2012	$ 793		$ 793