Discontinued Operations (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Discontinued Operations [Abstract]
Purchase price earn-out percent based on segment contracts	3.00%
Period of purchase price earn out payments (in years)	5 years
Disposal group purchase price earn out as percent of segment contracts with continued occupancy of building	4.00%
Amount due from ADI due to sale	$ 0	$ 3,000
Other income under the earn out agreement	$ 13,000	$ 3,000