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Mortgage Notes Payable - Schedule of Mortgage Notes Payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	$ 0	$ 171,569
Carrying amount of mortgage notes, other	4,073,916	4,066,511
Chandler Fashion Center
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 199,972	199,904
Effective interest rate (as a percent)	3.77%
Monthly debt service	$ 625
Danbury Fair Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	104,599
Carrying amount of mortgage notes, other	$ 202,158	104,598
Effective interest rate (as a percent)	5.53%
Monthly debt service	$ 1,538
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 199,622	199,298
Effective interest rate (as a percent)	4.01%
Monthly debt service	$ 642
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 109,651	112,770
Effective interest rate (as a percent)	4.89%
Monthly debt service	$ 727
Freehold Raceway Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 398,212	398,050
Effective interest rate (as a percent)	3.94%
Monthly debt service	$ 1,300
Fresno Fashion Fair
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 323,460	323,261
Effective interest rate (as a percent)	3.67%
Monthly debt service	$ 971
Green Acres Commons
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 128,006	$ 107,219
Effective interest rate (as a percent)	5.06%	4.07%
Monthly debt service	$ 488
Green Acres Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	$ 0
Carrying amount of mortgage notes, other	$ 284,686	291,366
Effective interest rate (as a percent)	3.61%
Monthly debt service	$ 1,447
Kings Plaza Shopping Center
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 437,120	447,231
Effective interest rate (as a percent)	3.67%
Monthly debt service	$ 2,229
Oaks, The
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 192,037	196,732
Effective interest rate (as a percent)	4.14%
Monthly debt service	$ 1,064
Pacific View
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 121,362	124,397
Effective interest rate (as a percent)	4.08%
Monthly debt service	$ 668
Queens Center
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 600,000	600,000
Effective interest rate (as a percent)	3.49%
Monthly debt service	$ 1,744
Santa Monica Place
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	297,069	296,366
Monthly debt service	939
SanTan Village Regional Center
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 121,585	124,703
Effective interest rate (as a percent)	3.14%
Monthly debt service	$ 589
Towne Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 20,733	21,161
Effective interest rate (as a percent)	4.48%
Monthly debt service	$ 117
Tucson La Encantada
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	66,970
Carrying amount of mortgage notes, other	$ 65,361	0
Effective interest rate (as a percent)	4.23%
Monthly debt service	$ 368
Victor Valley, Mall of
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 114,675	114,617
Effective interest rate (as a percent)	4.00%
Monthly debt service	$ 380
Vintage Faire Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 258,207	263,818
Effective interest rate (as a percent)	3.55%
Monthly debt service	$ 1,256
Westside Pavilion
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 0	$ 141,020

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