Investments in Unconsolidated Joint Ventures - Financial Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment in unconsolidated joint ventures:
Assets—Investments in unconsolidated joint ventures	$ 1,519,697	$ 1,492,655
Liabilities—Distributions in excess of investments in unconsolidated joint ventures	(107,902)	(114,988)
Revenues:
Leasing revenue	858,874	883,996
Leasing revenue			$ 909,592
Other			38,866
Total revenues			948,458
Expenses:
Shopping center and operating expenses			284,611
Interest expense			198,767
Depreciation and amortization			352,546
Total operating expenses			835,924
Loss on sale of assets			33,825
Net (loss) income			146,359
Company's equity in net (loss) income	48,508	71,773	85,546
PPR Portfolio
Revenues:
Leasing revenue			190,186
Other			1,848
Total revenues			192,034
Expenses:
Shopping center and operating expenses			41,340
Interest expense			67,053
Depreciation and amortization			101,625
Total operating expenses			210,018
Loss on sale of assets			(36)
Net (loss) income			(18,020)
Company's equity in net (loss) income			(453)
Other Joint Ventures
Revenues:
Leasing revenue			719,406
Other			37,018
Total revenues			756,424
Expenses:
Shopping center and operating expenses			243,271
Interest expense			131,714
Depreciation and amortization			250,921
Total operating expenses			625,906
Loss on sale of assets			33,861
Net (loss) income			164,379
Company's equity in net (loss) income			85,999
Joint venture
Assets:
Property, net	9,424,591	9,241,003
Other assets	772,116	703,861
Total assets	10,196,707	9,944,864
Liabilities and partners' capital:
Mortgage and other notes payable	6,144,685	6,050,930
Other liabilities	565,412	388,509
Company's capital	1,904,145	1,913,475
Outside partners' capital	1,582,465	1,591,950
Total liabilities and partners' capital	10,196,707	9,944,864
Investment in unconsolidated joint ventures:
Company's capital	1,904,145	1,913,475
Basis adjustment	(492,350)	(535,808)
Investments in unconsolidated joint ventures	1,411,795	1,377,667
Assets—Investments in unconsolidated joint ventures	1,519,697	1,492,655
Liabilities—Distributions in excess of investments in unconsolidated joint ventures	(107,902)	(114,988)
Investments in unconsolidated joint ventures	1,411,795	1,377,667
Total assets	10,196,707	9,944,864
Amortization of difference between cost of investments and book value of underlying equity	18,834	12,793	16,562
Revenues:
Leasing revenue	900,649	914,252
Other	50,782	42,325
Total revenues	951,431	956,577
Expenses:
Shopping center and operating expenses	288,126	285,935
Leasing expenses	8,293
Interest expense	217,465	213,032
Depreciation and amortization	374,055	346,663
Total operating expenses	887,939	845,630
Loss on sale of assets	(832)	14,331
Net (loss) income	62,660	125,278
Company's equity in net (loss) income	48,508	71,773
Joint venture | PPR Portfolio
Revenues:
Leasing revenue	187,789	186,924
Other	1,598	905
Total revenues	189,387	187,829
Expenses:
Shopping center and operating expenses	37,528	39,283
Leasing expenses	1,598
Interest expense	67,354	67,117
Depreciation and amortization	100,490	97,885
Total operating expenses	206,970	204,285
Loss on sale of assets	(452)	(140)
Net (loss) income	(18,035)	(16,596)
Company's equity in net (loss) income	(590)	(16)
Joint venture | Other Joint Ventures
Revenues:
Leasing revenue	712,860	727,328
Other	49,184	41,420
Total revenues	762,044	768,748
Expenses:
Shopping center and operating expenses	250,598	246,652
Leasing expenses	6,695
Interest expense	150,111	145,915
Depreciation and amortization	273,565	248,778
Total operating expenses	680,969	641,345
Loss on sale of assets	(380)	14,471
Net (loss) income	80,695	141,874
Company's equity in net (loss) income	49,098	71,789
Joint venture | PPR Portfolios
Assets:
Total assets	2,932,401	3,047,851
Investment in unconsolidated joint ventures:
Total assets	2,932,401	3,047,851
Total liabilities	$ 1,732,976	1,859,637
Affiliated entity | Northwestern Mutual Life (NML)
Expenses:
Interest expense on borrowings from related party		$ 20,197	$ 17,898