Commitments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Obligations for minimum royalties and consulting arrangements	$ 1.0
Commitments (Textual) [Abstract]
Initial terms of lease, minimum	2 years
Initial terms of lease, maximum	15 years
Irrevocable transferable letters of credit	5.6
Rent expense	12.0	10.8	9.9
capital leases, weighted average interest rate	14.60%
Maximum additional payment the Company is contingently obligated to make due to several purchase agreements	$ 20.2