Identified Intangible Assets and Intangible Liabilities (Tables)

9 Months Ended

Sep. 30, 2014

Finite-Lived Intangible Assets [Line Items]

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

	Balance as of
	September 30,		December 31,
(Amounts in thousands)	2014		2013
Identified intangible assets:
Gross amount	$	503,993	$	589,961
Accumulated amortization		(223,786)		(277,998)
Net	$	280,207	$	311,963
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	843,941	$	856,933
Accumulated amortization		(385,824)		(360,398)
Net	$	458,117	$	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	$	40,071
2016		38,455
2017		34,890
2018		33,381
2019		30,105

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	$	23,160
2016		20,195
2017		16,813
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