Real Estate Joint Ventures - Summarized Financial Information for Unconsolidated Investments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investments in and Advances to Affiliates [Line Items]
Total assets	$ 1,020,346				$ 1,020,346		$ 1,027,945
Equity	640,549				640,549		669,293
Net loss	$ (10,614)		$ (1,580)		$ (14,802)	$ (10,132)
Other affiliates
Investments in and Advances to Affiliates [Line Items]
Total assets		$ 11,000					11,500
Accounts payable and other liabilities		300					600
Equity		10,700					$ 10,900
Net loss		$ 200		$ 300