Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013 property	Sep. 30, 2012	Sep. 30, 2013 property	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 4,666		$ 4,666			$ 4,332
Equity Method Investment, Ownership Percentage	45.00%		45.00%
Payments to Acquire Interest in Joint Venture					3,000
Equity in Income/(Loss) of Nonconsolidated Investment	296	310	892	643
Capital distributions received from equity method investment	90		558
Capital Leased Assets, Number of Units	2		2
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
Capital Leases Balloon Payment In Direct Financing Leases	488		488
Capital Leases, Net Investment in Direct Financing Leases	$ 1,250		$ 1,250			$ 1,327
Capital Leased Land [Member]
Schedule of Equity Method Investments [Line Items]
Capital Leased Assets, Number of Units	5		5