Summary of Significant Accounting Policies (Summary of Supplemental Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of Significant Accounting Policies [Abstract]
Cash paid for interest	$ 170	$ 9
Distributions declared	874	757
Commissions and other offering costs accrued but not paid	343	263
Subscription receivable	175	(90)
Value of shares issued from distribution reinvestment program	401	343
Note receivable received in connection with disposition of investment in unconsolidated affiliated entity		$ 2,400