Restructuring (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Facility	Dec. 31, 2012	Dec. 31, 2011 Individual
Restructuring Cost and Reserve [Line Items]
Number of individuals by which workforce is reduced			30
Restructuring and related cost incurred	$ 3,856	$ 830	$ 1,216
Number of facilities	3
Restructuring activities [Abstract]
Beginning balance	222	1,407	2,189
Charges to expense	3,856	830	1,216
Payments	(2,777)	(1,528)	(1,994)
Foreign exchange			(4)
Non-cash adjustment		(487)
Ending balance	1,301	222	1,407
Restructuring accrual, current	1,301	222
Employee Termination Costs [Member]
Restructuring activities [Abstract]
Beginning balance	219	970	449
Charges to expense	1,943	830	1,137
Payments	(1,890)	(1,094)	(612)
Foreign exchange			(4)
Non-cash adjustment		(487)
Ending balance	272	219	970
Contract Exit Costs [Member]
Restructuring activities [Abstract]
Beginning balance	3	437	1,698
Charges to expense	1,913	0	104
Payments	(887)	(434)	(1,365)
Foreign exchange			0
Non-cash adjustment		0
Ending balance	1,029	3	437
Relocation [Member]
Restructuring activities [Abstract]
Beginning balance	0	0	42
Charges to expense	0	0	(25)
Payments	0	0	(17)
Foreign exchange			0
Non-cash adjustment		0
Ending balance	$ 0	$ 0	$ 0