Identified Intangible Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2016

Finite-Lived Intangible Assets [Line Items]

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

The following summarizes our identified intangible assets (primarily above-market leases) and liabilities (primarily acquired below-market leases) as of June 30,2016 and December 31,2015.

(Amounts in thousands)	Balance as of
	June 30, 2016		December 31, 2015
Identified intangible assets:
Gross amount	$	404,473	$	415,261
Accumulated amortization		(194,463)		(187,360)
Net	$	210,010	$	227,901
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	600,722	$	643,488
Accumulated amortization		(311,197)		(325,340)
Net	$	289,525	$	318,148

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]

Estimated annual amortization of acquired below-market leases, net of acquired above-market leases, for each of the five succeeding years commencing January 1, 2017 is as follows:

(Amounts in thousands)
2017	$	45,361
2018		44,101
2019		31,937
2020		23,365
2021		18,287

Other Identified Intangible Assets [Member]

Finite-Lived Intangible Assets [Line Items]

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

Estimated annual amortization of all other identified intangible assets including acquired in-place leases, customer relationships, and third party contracts for each of the five succeeding years commencing January 1, 2017 is as follows:

(Amounts in thousands)
2017	$	24,795
2018		20,541
2019		16,202
2020		12,404
2021		11,032

Tenant Under Ground Leases [Member]

Finite-Lived Intangible Assets [Line Items]

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

Estimated annual amortization of these below-market leases, net of above-market leases, for each of the five succeeding years commencing January 1, 2017 is as follows:

(Amounts in thousands)
2017	$	1,832
2018		1,832
2019		1,832
2020		1,832
2021		1,832