Summary of Significant Accounting Policies - Schedule of Unpaid Claims Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tenant Reinsurance Claims:
Unpaid claims liability at beginning of year	$ 7,326	$ 5,167	$ 3,896
Claims and claim adjustment expense for claims incurred in the current year	16,280	15,800	11,700
Claims and claim adjustment expense (benefit) for claims incurred in the prior years	98	107	(203)
Payments for current year claims	(11,352)	(11,010)	(8,895)
Payments for prior year claims	(4,243)	(2,738)	(1,331)
Unpaid claims liability at the end of the year	$ 8,109	$ 7,326	$ 5,167