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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Interest expense, related party	$ 2,175	$ 2,224	$ 6,567	$ 6,752
Due from affiliates	81,184		81,184		$ 68,227
Related parties note receivable, RED Consolidated Holdings, LLC
Related Party Transaction [Line Items]
Due from affiliates	$ 4,998		$ 4,998		5,593
Note receivable, interest rate	5.25%		5.25%
Interest income, related party	$ 66	81	$ 204	294
Northwestern Mutual Life (NML)
Related Party Transaction [Line Items]
Interest expense payable, related party	721		721		736
Unconsolidated Joint Ventures
Related Party Transaction [Line Items]
Due from affiliates	4,905		4,905
Due to affiliates					(6,809)
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco
Related Party Transaction [Line Items]
Interest income, related party	621	$ 583	1,839	$ 1,629
Note receivable	$ 71,281		$ 71,281		$ 69,443
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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