The Company and Financial Statement Presentation - Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Real estate, net	$ 2,490,131	$ 3,309,900
Total assets	3,171,940	3,553,020
Mortgages and notes payable, net	585,369	689,810
Total liabilities	1,774,939	2,212,185
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Real estate, net	519,443	682,587
Total assets	674,523	766,025
Mortgages and notes payable, net	193,050	212,792
Total liabilities	$ 204,072	$ 226,331