Goodwill and Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Intangible Assets
Gross Amount	$ 9,357	$ 12,407
Accumulated Amortization	3,813	5,309
Net Amount	5,544	7,098
Patents, trademarks & URLs
Intangible Assets
Weighted Average Estimated Useful Lives	4 years
Gross Amount	5,808	5,808
Accumulated Amortization	2,267	1,436
Net Amount	3,541	4,372
Customer relationships
Intangible Assets
Weighted Average Estimated Useful Lives	9 years
Gross Amount	3,299	6,349
Accumulated Amortization	1,339	3,713
Net Amount	1,960	2,636
Non-compete agreements
Intangible Assets
Weighted Average Estimated Useful Lives	4 years
Gross Amount	250	250
Accumulated Amortization	207	160
Net Amount	$ 43	$ 90