Restructuring (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Number of individuals by which workforce is reduced		30	125
Restructuring and related cost incurred	$ 830	$ 1,216	$ 5,006
Restructuring activities [Abstract]
Beginning balance	1,407	2,189	879
Charges to expense	830	1,216	4,846
Payments	(1,528)	(1,994)	(3,546)
Foreign exchange		(4)	10
Non-Cash Adjustment	(487)
Ending balance	222	1,407	2,189
Restructuring accrual, current	222	1,407
Prior Year Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost incurred			160
Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost incurred	1,167		2,116
Restructuring activities [Abstract]
Beginning balance	970	449	662
Charges to expense	830	1,137	2,116
Payments	(1,094)	(612)	(2,339)
Foreign exchange		(4)	10
Non-Cash Adjustment	(487)
Ending balance	219	970	449
Employee Termination Costs [Member] | Prior Year Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost incurred		49
Lease & Contract Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost incurred			2,225
Restructuring activities [Abstract]
Beginning balance	437	1,698	217
Charges to expense	0	104	2,225
Payments	(434)	(1,365)	(744)
Foreign exchange		0	0
Non-Cash Adjustment	0
Ending balance	3	437	1,698
Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost incurred			505
Restructuring activities [Abstract]
Beginning balance	0	42	0
Charges to expense	0	(25)	505
Payments	0	(17)	(463)
Foreign exchange		0	0
Non-Cash Adjustment	0
Ending balance	$ 0	$ 0	$ 42