Basis of Presentation - Narrative (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Investments in unconsolidated real estate ventures	$ 63,868,000	$ 75,907,000
Cash distributions in unconsolidated real estate ventures	43,273,000	$ 5,816,000
Reclassification
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Investments in unconsolidated real estate ventures	(5,816)
Cash distributions in unconsolidated real estate ventures	$ 5,816