Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 02, 2018	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Summary of Significant Accounting Policies
Cash paid for interest			$ 5,621	$ 5,163
Distributions declared but not paid			3,992	4,240
Investment property acquired but not paid			300	6
Assets transferred due to foreclosure			37,299	13,521
Liabilities extinguished/credited in foreclosure			50,914	20,658
Reclassification of accumulated other comprehensive income and noncontrolling interests to accumulated surplus	$ 15,500			15,476
Holding gain/loss on marketable securities			2,430	1,289
Value of shares issued from distribution reinvestment program		$ 74	$ 200
Transfer of membership interests from noncontrolling interests to additional paid-in-capital				$ 1,500