Identified Intangible Assets and Intangible Liabilities (Tables)

6 Months Ended

Jun. 30, 2014

Finite-Lived Intangible Assets [Line Items]

Schedule of Identified Intangible Assets and Intangible Liabilities [Table Text Block]

	Balance as of
	June 30,		December 31,
(Amounts in thousands)	2014		2013
Identified intangible assets:
Gross amount	$	522,924	$	589,961
Accumulated amortization		(233,449)		(277,998)
Net	$	289,475	$	311,963
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	850,629	$	856,933
Accumulated amortization		(380,356)		(360,398)
Net	$	470,273	$	496,535

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)
2015	$	39,999
2016		38,377
2017		34,812
2018		33,330
2019		30,093

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)
2015	$	23,159
2016		20,223
2017		16,826
2018		12,446
2019		11,539

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)
2015	$	3,430
2016		3,430
2017		3,430
2018		3,430
2019		3,430