Identified Intangible Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2015

Finite-Lived Intangible Assets [Line Items]

Schedule of Identified Intangible Assets and Intangible Liabilities (Table)

(Amounts in thousands)	Balance as of
	September 30, 2015		December 31, 2014
Identified intangible assets:
Gross amount	$	432,357	$	424,976
Accumulated amortization		(190,543)		(199,821)
Net	$	241,814	$	225,155
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	666,370	$	657,976
Accumulated amortization		(316,908)		(329,775)
Net	$	349,462	$	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	$	51,780
2017		44,079
2018		42,733
2019		30,775
2020		23,143

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	$	30,165
2017		24,745
2018		20,373
2019		15,685
2020		12,245

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