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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Due from affiliates	$ 83,275		$ 83,275		$ 82,162
Related parties note receivable, RED Consolidated Holdings, LLC
Related Party Transaction [Line Items]
Due from affiliates	$ 4,114		$ 4,114		4,796
Note receivable, interest rate	5.25%		5.25%
Interest income, related party	$ 57	$ 68	$ 117	$ 138
Northwestern Mutual Life (NML)
Related Party Transaction [Line Items]
Interest expense, related party	2,131	2,181	4,278	4,392
Interest expense payable, related party	705		705		716
Joint Venture | Financing Arrangement
Related Party Transaction [Line Items]
Interest expense	(4,893)		3,129
Unconsolidated Joint Ventures
Related Party Transaction [Line Items]
Due from affiliates	5,683		5,683		5,411
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco
Related Party Transaction [Line Items]
Interest income, related party	773	$ 607	1,522	$ 1,218
Note receivable	$ 73,478		$ 73,478		$ 71,955
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco | LIBOR
Related Party Transaction [Line Items]
Note receivable, interest rate	2.00%		2.00%

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