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Segment Reporting - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 16, 2017
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively	$ 9,302	$ 23,371	$ 39,449
Core Portfolio
Segment Reporting Information [Line Items]
Equity method investment, ownership percentage	75.22%	61.11%		22.22%
Core Portfolio | Town Center
Segment Reporting Information [Line Items]
Equity method investment, ownership percentage	75.22%
Operating Segments | Core Portfolio
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively	$ 7,415	$ 3,735	3,774
Operating Segments | Core Portfolio | Town Center
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively	$ 5,800	$ 1,900	$ 900
Equity method investment, ownership percentage	75.22%			22.22%
Property related cost	$ 700

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