Identified Intangible Assets and Intangible Liabilities (Tables)

3 Months Ended

Mar. 31, 2012

Schedule of Identified Intangible Assets and Intangible Liabilities (Table)

	Balance as of
	March 31,		December 31,
(Amounts in thousands)	2012		2011
Identified intangible assets:
Gross amount	$	666,241	$	679,648
Accumulated amortization		(361,856)		(359,944)
Net	$	304,385	$	319,704
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	837,729	$	841,440
Accumulated amortization		(385,886)		(374,253)
Net	$	451,843	$	467,187

Below Market Leases Net Of Above Market Leases [Member]

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

(Amounts in thousands)
2013	$	44,133
2014		37,504
2015		34,399
2016		31,339
2017		25,819

Other Identified Intangible Assets [Member]

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

(Amounts in thousands)
2013	$	40,162
2014		21,758
2015		16,757
2016		14,156
2017		11,709

Tenant Under Ground Leases [Member]

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

(Amounts in thousands)
2013	$	1,377
2014		1,377
2015		1,377
2016		1,377
2017		1,377