Notes Payable (US Nationwide Loan 2) (Narrative) (Details) (USD $)	0 Months Ended		12 Months Ended		1 Months Ended	3 Months Ended		12 Months Ended				36 Months Ended
	Feb. 21, 2011 US Nationwide Loan 2 [Member]	Jul. 21, 2008 US Nationwide Loan 2 [Member] item	Dec. 31, 2012 US Nationwide Loan 2 [Member] item	Dec. 31, 2010 US Nationwide Loan 2 [Member]	Sep. 30, 2010 US Nationwide Loan 1 [Member]	Mar. 31, 2010 US Nationwide Loan 1 [Member]	Mar. 31, 2009 US Nationwide Loan 1 [Member]	Dec. 31, 2012 US Nationwide Loan 1 [Member]	Dec. 31, 2011 US Nationwide Loan 1 [Member]	Dec. 31, 2009 US Nationwide Loan 1 [Member]	Dec. 31, 2008 US Nationwide Loan 1 [Member]	Dec. 31, 2010 US Nationwide Loan 1 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 3,000,000
Number of draws		1	2
Amount of draw			1,500,000
Purchase price adjustment					(12,500,000)	(4,400,000)	(226,000)			3,000,000	(6,300,000)	(20,400,000)
Amount of loan waived				1,500,000
Line of credit facility, amount outstanding	1,500,000							593,000
Interest rate	8.50%							8.50%	8.50%
Repayment of debt	1,500,000
Interest paid	$ 359,000