Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS:
Investment properties at cost	$ 34,764,669	$ 34,252,521
Less - accumulated depreciation	9,804,069	9,068,388
Investment properties, net	24,960,600	25,184,133
Cash and cash equivalents	1,099,321	1,184,518
Tenant receivables and accrued revenue, net	529,893	521,301
Investment in unconsolidated entities, at equity	1,991,900	2,108,966
Investment in Klepierre, at equity	1,971,230	2,016,954
Deferred costs and other assets	1,558,465	1,570,734
Total assets	32,111,409	32,586,606
LIABILITIES:
Mortgages and unsecured indebtedness	22,729,654	23,113,007
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,328,089	1,374,172
Cash distributions and losses in partnerships and joint ventures, at equity	842,062	724,744
Other liabilities	227,319	303,588
Total liabilities	25,127,124	25,515,511
Commitments and contingencies
Preferred units, various series, at liquidation value, and noncontrolling redeemable interests in properties	179,792	178,006
Partners' Equity
Preferred units, 796,948 units outstanding. Liquidation value of $39,847	44,472	44,719
General Partner, 310,333,283 and 309,903,824 units outstanding, respectively	5,784,347	5,865,885
Limited Partners, 52,120,854 and 51,952,554 units outstanding, respectively	971,488	983,362
Total partners' equity	6,800,307	6,893,966
Nonredeemable noncontrolling interests in properties, net	4,186	(877)
Total equity	6,804,493	6,893,089
Total liabilities and equity	$ 32,111,409	$ 32,586,606