Investments (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013 property	Jun. 30, 2012	Jun. 30, 2013 property	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2012
Investments [Abstract]
Equity Investments	$ 4,460,000		$ 4,460,000			$ 4,332,000
Equity Method Investment, Ownership Percentage	45.00%		45.00%
Payments to Acquire Interest in Joint Venture					3,000,000
Equity in Income/(Loss) of Nonconsolidated Investment	420,000	309,000	596,000	332,000
Capital distributions received from equity method investment	90,000		468,000
Capital Leased Assets, Number of Units	5		5
Capital Lease Length Of Lease Term	9 years 6 months		9 years 6 months
Capital Lease Length Of Renewal Term	5 years 6 months		5 years 6 months
Capital Leases, Monthly Rent			17,000
Capital Leases Balloon Payment In Direct Financing Leases	488,000		488,000
Capital Leases, Net Investment in Direct Financing Leases	$ 1,277,000		$ 1,277,000			$ 1,327,000