Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
ASSETS:
Investment properties at cost	$ 34,063,214	$ 29,657,046
Less - accumulated depreciation	8,827,205	8,388,130
Investment properties, net	25,236,009	21,268,916
Cash and cash equivalents	638,499	798,650
Tenant receivables and accrued revenue, net	423,917	486,731
Investment in unconsolidated entities, at equity	2,000,509	1,378,084
Investment in Klepierre, at equity	1,942,153
Deferred costs and other assets	1,745,496	1,633,544
Notes receivable from related party		651,000
Total assets	31,986,583	26,216,925
LIABILITIES:
Mortgages and other indebtedness	22,466,558	18,446,440
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,168,636	1,091,712
Cash distributions and losses in partnerships and joint ventures, at equity	730,636	695,569
Other liabilities	226,675	170,971
Total liabilities	24,592,505	20,404,692
Commitments and contingencies
Limited partners' preferred interest in the Operating Partnership and noncontrolling redeemable interests in properties	263,479	267,945
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	44,883	45,047
Capital in excess of par value	9,091,935	8,103,133
Accumulated deficit	(2,974,231)	(3,251,740)
Accumulated other comprehensive loss	(81,656)	(94,263)
Common stock held in treasury at cost, 3,762,595 and 3,877,448 shares, respectively	(135,781)	(152,541)
Total stockholder's equity	5,945,181	4,649,666
Noncontrolling interests	1,185,418	894,622
Total equity	7,130,599	5,544,288
Total liabilities and equity	31,986,583	26,216,925
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	30
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