Restructuring Costs Schedule of restructuring liabilities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Restructuring Reserve [Roll Forward]
Balance at December 31, 2011			$ 1,819
Restructuring charges	3,003	3,119	5,434	3,119
Cost paid or otherwise settled			(3,603)
Effect of change in exchange rates			(14)
Balance at June 30, 2012	3,636		3,636
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance at December 31, 2011			800
Restructuring charges			2,200
Cost paid or otherwise settled			(1,041)
Effect of change in exchange rates			(14)
Balance at June 30, 2012	1,945		1,945
Property and Equipment Impairments [Member]
Restructuring Reserve [Roll Forward]
Balance at December 31, 2011			0
Restructuring charges			649
Cost paid or otherwise settled			(649)
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			2,585
Cost paid or otherwise settled			(1,913)
Effect of change in exchange rates			0
Balance at June 30, 2012	$ 1,691		$ 1,691