Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS:
Investment properties at cost	$ 35,598,458	$ 35,126,344
Less - accumulated depreciation	10,309,988	10,067,743
Investment properties, net	25,288,470	25,058,601
Cash and cash equivalents	1,013,368	1,716,863
Tenant receivables and accrued revenue, net	530,479	581,482
Investment in unconsolidated entities, at equity	2,347,523	2,433,399
Investment in Klepierre, at equity	2,010,771	2,014,415
Deferred costs and other assets	1,564,988	1,519,814
Total assets	32,755,599	33,324,574
LIABILITIES:
Mortgages and unsecured indebtedness	23,186,610	23,588,531
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,259,452	1,374,113
Cash distributions and losses in partnerships and joint ventures, at equity	1,139,034	1,091,591
Other liabilities	198,610	257,222
Total liabilities	25,783,706	26,311,457
Commitments and contingencies
Preferred units, at liquidation value, and noncontrolling redeemable interests in properties	107,612	190,485
Partners' Equity
Preferred units, 796,948 units outstanding. Liquidation value of $39,847	44,308	44,390
General Partner, 310,658,536 and 310,608,565 units outstanding, respectively	5,829,985	5,805,016
Limited Partners, 52,822,430 and 51,846,157 units outstanding, respectively	991,294	968,962
Total partners' equity	6,865,587	6,818,368
Nonredeemable noncontrolling (deficit) interests in properties, net	(1,306)	4,264
Total equity	6,864,281	6,822,632
Total liabilities and equity	$ 32,755,599	$ 33,324,574