Restructuring Narrative (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Employees	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Number of employees in workforce reduction (in number of employees)		70
Restructuring charges	$ 400	$ 4,200	$ 1,843	$ 406	$ 4,886
Leases
Restructuring Cost and Reserve [Line Items]
Restructuring charges		700	940
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 903