Summary of Significant Accounting Policies - Basis of Presentation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Investments in unconsolidated real estate ventures	$ 125,326	$ 75,907
Cash distributions in unconsolidated real estate ventures	$ 45,197	5,816
Reclassification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Investments in unconsolidated real estate ventures		(5,816)
Cash distributions in unconsolidated real estate ventures		$ 5,816