Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Schedule of estimated useful lives

Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:

Category	Term
Building (fee ownership)	40 years
Building improvements	shorter of remaining life of the building or useful life
Building (leasehold interest)	lesser of 40 years or remaining term of the lease
Property under capital lease	remaining lease term
Furniture and fixtures	four to seven years
Tenant improvements	shorter of remaining term of the lease or useful life

Summary of identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases)

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of December 31, 2014 and 2013 (in thousands):

	December 31,
	2014			2013
Identified intangible assets (included in other assets):
Gross amount	$	664,297		$	746,704
Accumulated amortization	(383,236		)	(343,339		)
Net	$	281,061		$	403,365
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	655,755		$	671,380
Accumulated amortization	(483,948		)	(429,138		)
Net	$	171,807		$	242,242

Schedule of estimated annual amortization of acquired below-market leases, net of acquired above-market leases

The estimated annual amortization of acquired above-market leases, net of acquired (below-market) leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands):

2015	$	1,978
2016	(592		)
2017	(1,303		)
2018	(3,135		)
2019	(3,994		)

Schedule of estimated annual amortization of all other identifiable assets

The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (in thousands):

2015	$	9,150
2016	5,919
2017	4,442
2018	3,005
2019	2,467

Schedule of marketable securities

At December 31, 2014 and 2013, we held the following marketable securities (in thousands):

	December 31,
	2014		2013
Equity marketable securities	$	4,332	$	4,307
Commercial mortgage-backed securities	35,097		24,419
Rake bonds	—		3,323
Total marketable securities available-for-sale	$	39,429	$	32,049