Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Real estate, net	$ 3,115,298	$ 2,856,014
Total assets	3,493,226	3,180,260
Mortgages and notes payable, net	136,529	390,272
Total liabilities	1,502,089	1,455,541
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Real estate, net	569,461	592,372
Total assets	679,786	645,623
Mortgages and notes payable, net	25,600	82,978
Total liabilities	$ 40,974	$ 101,901