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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Related party transactions
Interest expense, related party	$ 2,256	$ 2,709	$ 4,528	$ 5,438
Due from affiliates	70,615		70,615		$ 83,928
Related parties note receivable, RED Consolidated Holdings, LLC
Related party transactions
Due from affiliates	$ 6,008		$ 6,008		9,252
Note receivable, interest rate (percent)	5.25%		5.25%
Interest income, related party	$ 97	131	$ 214	269
Unconsolidated Joint Ventures and Third Party Managed Properties
Related party transactions
Management fees	5,016	2,460	8,969	4,671
Development and leasing fees	4,236	1,588	7,197	3,480
Fees charged to unconsolidated joint ventures and third-party managed properties	9,252	4,048	16,166	8,151
Northwestern Mutual Life (NML)
Related party transactions
Interest expense payable, related party	747		747		756
Unconsolidated Joint Ventures
Related party transactions
Due from affiliates	3,648		3,648
Due to affiliates					7,467
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco
Related party transactions
Interest income, related party	525	$ 450	1,046	$ 883
Note receivable	$ 68,255		$ 68,255		$ 67,209
Affiliated Entity | Notes Receivable | LIBOR | Fashion Outlets of San Francisco
Related party transactions
Note receivable, interest rate (percent)	2.00%		2.00%

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