Tenant and Other Receivables, Net (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Tenants	$ 30,672,000	$ 26,278,000
Third-party real estate services	8,954,000	2,488,000
Other	12,992,000	8,826,000
Allowance for doubtful accounts	(5,884,000)	(4,212,000)
Total tenant and other receivables, net	46,734,000	33,380,000
Bad debt expense	$ 3,807,000	$ 750,600	$ 1,407,000