The Company and Financial Statement Presentation - Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Real estate, net	$ 3,033,353	$ 3,309,900
Total assets	3,476,191	3,553,020
Mortgages and notes payable, net	701,774	689,810
Total liabilities	2,246,895	2,212,185
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Real estate, net	627,078	682,587
Total assets	755,542	766,025
Mortgages and notes payable, net	238,285	212,792
Total liabilities	$ 250,208	$ 226,331