Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS:
Investment properties at cost	$ 34,636,100	$ 34,252,521
Less - accumulated depreciation	9,544,943	9,068,388
Investment properties, net	25,091,157	25,184,133
Cash and cash equivalents	1,095,829	1,184,518
Tenant receivables and accrued revenue, net	491,388	521,301
Investment in unconsolidated entities, at equity	1,958,503	2,108,966
Investment in Klepierre, at equity	1,903,839	2,016,954
Deferred costs and other assets	1,474,421	1,570,734
Total assets	32,015,137	32,586,606
LIABILITIES:
Mortgages and unsecured indebtedness	22,687,622	23,113,007
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,273,211	1,374,172
Cash distributions and losses in partnerships and joint ventures, at equity	836,265	724,744
Other liabilities	231,774	303,588
Total liabilities	25,028,872	25,515,511
Commitments and contingencies
Limited partners' preferred interest in the Operating Partnership and noncontrolling redeemable interests in properties	180,018	178,006
Capital stock (850,000,000 total shares authorized, $ 0.0001 par value, 238,000,000 shares of excess common stock, 100,000,000 authorized shares of preferred stock):
Series J 8 3/8% cumulative redeemable preferred stock, 1,000,000 shares authorized, 796,948 issued and outstanding with a liquidation value of $ 39,847	44,554	44,719
Capital in excess of par value	9,184,788	9,175,724
Accumulated deficit	(3,174,266)	(3,083,190)
Accumulated other comprehensive loss	(102,327)	(90,900)
Common stock held in treasury at cost, 3,651,580 and 3,762,595 shares, respectively	(118,031)	(135,781)
Total stockholders' equity	5,834,749	5,910,603
Noncontrolling interests	971,498	982,486
Total equity	6,806,247	6,893,089
Total liabilities and equity	32,015,137	32,586,606
Common stock
Capital stock (850,000,000 total shares authorized, $ 0.0001 par value, 238,000,000 shares of excess common stock, 100,000,000 authorized shares of preferred stock):
Common stock	31	31
Class B common stock
Capital stock (850,000,000 total shares authorized, $ 0.0001 par value, 238,000,000 shares of excess common stock, 100,000,000 authorized shares of preferred stock):
Common stock