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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Interest expense, related party	$ 2,181	$ 2,256	$ 4,392	$ 4,528
Due from affiliates	81,545		81,545		$ 68,227
Related parties note receivable, RED Consolidated Holdings, LLC
Related Party Transaction [Line Items]
Due from affiliates	$ 4,933		$ 4,933		5,593
Note receivable, interest rate	5.25%		5.25%
Interest income, related party	$ 68	97	$ 138	214
Northwestern Mutual Life (NML)
Related Party Transaction [Line Items]
Interest expense payable, related party	726		726		736
Unconsolidated Joint Ventures
Related Party Transaction [Line Items]
Due from affiliates	5,952		5,952
Due to affiliates					(6,809)
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco
Related Party Transaction [Line Items]
Interest income, related party	607	$ 525	1,218	$ 1,046
Note receivable	$ 70,660		$ 70,660		$ 69,443
Affiliated Entity | Notes Receivable | LIBOR | Fashion Outlets of San Francisco
Related Party Transaction [Line Items]
Note receivable, interest rate	2.00%		2.00%

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