Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid expenses	$ 3,189	$ 2,712
Sales taxes receivable from customers	598	984
Stop loss insurance reimbursement on medical claims	0	364
Due from prior owners of acquired businesses for working capital settlements	955	0
Research and development tax credits receivable	266	0
Other	108	442
Total	$ 5,116	$ 4,502