Identified Intangible Assets and Intangible Liabilities (Tables)

3 Months Ended

Mar. 31, 2015

Finite-Lived Intangible Assets and Liabilities [Line Items]

Schedule of Identified Intangible Assets and Intangible Liabilities (Table)

	Balance as of
	March 31,		December 31,
(Amounts in thousands)	2015		2014
Identified intangible assets:
Gross amount	$	429,909	$	424,976
Accumulated amortization		(200,330)		(199,821)
Net	$	229,579	$	225,155
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	620,891	$	657,976
Accumulated amortization		(304,929)		(329,775)
Net	$	315,962	$	328,201

Below Market Leases Net Of Above Market Leases [Member]

Finite-Lived Intangible Assets and Liabilities [Line Items]

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

(Amounts in thousands)
2016	$	36,804
2017		34,829
2018		33,546
2019		23,514
2020		21,505

Other Identified Intangible Assets [Member]

Finite-Lived Intangible Assets and Liabilities [Line Items]

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

(Amounts in thousands)
2016	$	22,523
2017		17,692
2018		13,373
2019		11,425
2020		10,651

Tenant Under Ground Leases [Member]

Finite-Lived Intangible Assets and Liabilities [Line Items]

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

(Amounts in thousands)
2016	$	1,832
2017		1,832
2018		1,832
2019		1,832
2020		1,832