Identified Intangible Assets and Intangible Liabilities (Tables)

12 Months Ended

Dec. 31, 2012

Finite-Lived Intangible Assets [Line Items]

Schedule of Identified Intangible Assets and Intangible Liabilities (Table)

	Balance as of
	December 31,		December 31,
(Amounts in thousands)	2012		2011
Identified intangible assets:
Gross amount	$	726,981	$	631,162
Accumulated amortization		(356,379)		(343,318)
Net	$	370,602	$	287,844
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	805,811	$	838,103
Accumulated amortization		(342,379)		(371,360)
Net	$	463,432	$	466,743

Below Market Leases Net Of Above Market Leases [Member]

Finite-Lived Intangible Assets [Line Items]

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

(Amounts in thousands)
2013	$	45,098
2014		39,304
2015		36,533
2016		34,088
2017		28,610

Other Identified Intangible Assets [Member]

Finite-Lived Intangible Assets [Line Items]

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

(Amounts in thousands)
2013	$	47,959
2014		29,785
2015		24,812
2016		22,300
2017		19,735

Tenant Under Ground Leases [Member]

Finite-Lived Intangible Assets [Line Items]

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

(Amounts in thousands)
2013	$	2,933
2014		2,918
2015		2,918
2016		2,918
2017		2,918