Identified Intangible Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2015

Finite-Lived Intangible Assets [Line Items]

Schedule of Identified Intangible Assets and Intangible Liabilities (Table)

(Amounts in thousands)	Balance as of
	June 30, 2015		December 31, 2014
Identified intangible assets:
Gross amount	$	453,590	$	424,976
Accumulated amortization		(207,744)		(199,821)
Net	$	245,846	$	225,155
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	668,314	$	657,976
Accumulated amortization		(306,956)		(329,775)
Net	$	361,358	$	328,201

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)
2016	$	51,912
2017		49,937
2018		48,654
2019		29,912
2020		21,681

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)
2016	$	29,217
2017		24,385
2018		20,067
2019		14,246
2020		10,703

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)
2016	$	1,832
2017		1,832
2018		1,832
2019		1,832
2020		1,832