Acquisitions (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Human Concepts [Member]
Business Acquisition [Line Items]
Amount paid upon closing for the acquisition	$ 10.8
Current year or prior year payment based on terms of the agreement	1.2
OneMind Connect, Inc. [Member]
Business Acquisition [Line Items]
Amount paid upon closing for the acquisition	5.5
Current year or prior year payment based on terms of the agreement	1.3
Galaxy Technologies, Inc. [Member]
Business Acquisition [Line Items]
Amount paid upon closing for the acquisition	7.4
Current year or prior year payment based on terms of the agreement	$ 1.4