Investments in Unconsolidated Entities - Dispositions (Details) - Unconsolidated properties $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($) property
Investment in Unconsolidated Entities
Gain on sale or disposal of assets and interests in unconsolidated entities, net	$ 101,051	$ 67,176
Retail properties | Disposed by Sales
Investment in Unconsolidated Entities
Number of properties disposed of during the period | property	4	3
Gain on sale or disposal of assets and interests in unconsolidated entities, net	$ 22,600	$ 43,600
Residential properties | Disposed by Sales
Investment in Unconsolidated Entities
Number of properties disposed of during the period | property	2
Gain on sale or disposal of assets and interests in unconsolidated entities, net	$ 36,200