Investments (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013 property	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 4,130,000			$ 4,332,000
Equity Method Investment, Ownership Percentage	45.00%
Payments to Acquire Interest in Joint Venture			3,000,000
Equity in Income/(Loss) of Nonconsolidated Investment	176,000	23,000
Capital distributions received from equity method investment	378,000
Capital Leased Assets, Number of Units	5
Capital Lease Length Of Lease Term	9 years 6 months
Capital Lease Length Of Renewal Term	5 years 6 months
Capital Leases, Monthly Rent	17,000
Capital Leases Balloon Payment In Direct Financing Leases	488,000
Capital Leases, Net Investment in Direct Financing Leases	1,302,000			1,327,000
Increase as a result of the amendment [Member]
Schedule of Equity Method Investments [Line Items]
Capital Leases, Monthly Rent	$ 7,000