Goodwill and Intangible Assets (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Goodwill and Intangible Assets
Goodwill	$ 25,510,000	$ 25,510,000
Goodwill and Intangible Assets
Gross Amount	17,475,000	17,385,000
Accumulated Amortization	9,079,000	7,545,000
Net Amount	8,396,000	9,840,000
Patent, trademarks & URLs
Goodwill and Intangible Assets
Weighted Average Estimated Useful Lives (in years)	4 years
Gross Amount	5,805,000	5,715,000
Accumulated Amortization	882,000	372,000
Net Amount	4,923,000	5,343,000
Trademarks | SARCOM
Goodwill and Intangible Assets
Amount included in the total for Patents, trademarks and URLs	2,900,000	2,900,000
Customer relationships
Goodwill and Intangible Assets
Weighted Average Estimated Useful Lives (in years)	6 years
Gross Amount	10,600,000	10,600,000
Accumulated Amortization	7,319,000	6,431,000
Net Amount	3,281,000	4,169,000
Non-compete agreements
Goodwill and Intangible Assets
Weighted Average Estimated Useful Lives (in years)	4 years
Gross Amount	1,070,000	1,070,000
Accumulated Amortization	878,000	742,000
Net Amount	$ 192,000	$ 328,000