Property, net - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 17, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Real Estate [Abstract]
Depreciation expense		$ 71,453	$ 66,850	$ 142,170	$ 134,794
Property, Plant and Equipment [Line Items]
Loss on sale or write down of assets, net		(9,059)	(9,518)	(15,375)	(47,030)
Write down of development costs		$ (9,059)	(666)	$ (15,909)	(2,257)
Two freestanding stores
Property, Plant and Equipment [Line Items]
Impairment loss			(7,494)		(7,494)
Southridge Center
Property, Plant and Equipment [Line Items]
Impairment loss			(1,660)		(1,660)
Promenade at Casa Grande
Property, Plant and Equipment [Line Items]
Loss on sale or write down of assets, net	$ (311)
Impairment loss					(1,043)
Gain (loss) on disposal			$ (311)		311
South Park Mall
Property, Plant and Equipment [Line Items]
Impairment loss					$ (36,338)