Identified Intangible Assets and Intangible Liabilities (Tables)

12 Months Ended

Dec. 31, 2013

Finite-Lived Intangible Assets [Line Items]

Schedule of Identified Intangible Assets and Intangible Liabilities (Table)

	Balance as of December 31,
(Amounts in thousands)	2013		2012
Identified intangible assets:
Gross amount	$	605,915	$	767,365
Accumulated amortization		(282,593)		(352,035)
Net	$	323,322	$	415,330
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	892,487	$	902,525
Accumulated amortization		(382,002)		(341,536)
Net	$	510,485	$	560,989

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)
2014	$	45,588
2015		42,095
2016		40,489
2017		35,173
2018		33,408

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)
2014	$	29,238
2015		23,869
2016		20,689
2017		17,260
2018		12,860

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)
2014	$	3,430
2015		3,430
2016		3,430
2017		3,430
2018		3,430