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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Due (to) from affiliates	$ 85,181	$ 82,162
Related Parties Note Receivable, RED Consolidated Holdings, LLC
Related Party Transaction [Line Items]
Due (to) from affiliates	$ 3,689	4,796
Notes receivable interest rate	5.25%
Interest earned	$ 224	268	$ 366
Northwestern Mutual Life (NML)
Related Party Transaction [Line Items]
Interest expense, related party	6,883	8,731	8,973
Interest expense payable, related party		716
Unconsolidated joint ventures
Related Party Transaction [Line Items]
Due (to) from affiliates	6,385	5,411
Affiliated entity | Notes receivable | Fashion Outlets of San Francisco
Related Party Transaction [Line Items]
Interest earned	3,152	2,513	$ 2,234
Note receivable	$ 75,107	$ 71,955
Affiliated entity | Notes receivable | Fashion Outlets of San Francisco | LIBOR
Related Party Transaction [Line Items]
Notes receivable interest rate	2.00%

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