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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Interest expense, related party	$ 10,169	$ 2,211
Due from affiliates	84,674		$ 82,162
Related parties note receivable, RED Consolidated Holdings, LLC
Related Party Transaction [Line Items]
Due from affiliates	$ 4,590		4,796
Note receivable, interest rate	5.25%
Interest income, related party	$ 60	70
Northwestern Mutual Life (NML)
Related Party Transaction [Line Items]
Interest expense, related party	2,147	2,211
Interest expense payable, related party	710		716
Unconsolidated Joint Ventures
Related Party Transaction [Line Items]
Due from affiliates	7,380
Due to affiliates			5,411
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco
Related Party Transaction [Line Items]
Interest income, related party	749	$ 611
Note receivable	$ 72,704		$ 71,955
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco | LIBOR
Related Party Transaction [Line Items]
Note receivable, interest rate	2.00%

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