Acquisitions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2013 COWEB [Member]	Jan. 10, 2013 COWEB [Member]	Mar. 31, 2013 Geomagic [Member]	Feb. 27, 2013 Geomagic [Member]
Business Acquisition [Line Items]
Date of acquisition	Jan. 10, 2013		Feb. 27, 2013
Consideration paid for this acquisition, net of cash acquired		$ 262		$ 52,687
Business acquisition, ownership percentage		100.00%		100.00%
Maximum earnout payment		$ 655
Commencement date of earn out	Feb. 01, 2013
Period of time earn out in affect	4 years