Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Real estate, net	$ 2,856,014	$ 2,555,659
Total assets	3,180,260	2,953,840
Mortgages and notes payable, net	390,272	570,420
Total liabilities	1,455,541	1,607,162
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Real estate, net	592,372	509,916
Total assets	645,623	607,963
Mortgages and notes payable, net	82,978	192,791
Total liabilities	$ 101,901	$ 203,322