Discontinued Operations and Assets Held for Sale (Tables)

12 Months Ended

Dec. 31, 2018

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Real Estate Properties [Table Text Block]

Real estate assets, excluding assets held-for-sale, consisted of the following (in thousands):

	December 31, 2018		December 31, 2017
Buildings and tenant improvements	$	4,980,003	$	4,642,832
Land and improvements	2,268,343		1,950,735
Real estate assets	$	7,248,346	$	6,593,567

Table Illustration of Number of Properties in Discontinued Operations

The following table illustrates the number of sold or held-for-sale properties included in, or excluded from, discontinued operations:

	Held-for-Sale at December 31, 2018	Sold in 2018	Sold in 2017	Sold in 2016	Total
Industrial	—	—	—	—	—
Non-Reportable Rental Operations	—	—	81	—	81
Total properties included in discontinued operations	—	—	81	—	81
Properties excluded from discontinued operations	—	15	17	32	64
Total properties sold or classified as held-for-sale	—	15	98	32	145

Table Illustration of Discontinued Operations in Income Statement

The following table illustrates the operational results of the buildings reflected in discontinued operations for the years ended December 31, 2018, 2017 and 2016, respectively (in thousands):

	2018			2017			2016
Revenues	$	117		$	87,185		$	172,716
Operating expenses	(9		)	(28,102		)	(52,795		)
Depreciation and amortization	—			(25,911		)	(75,261		)
Operating income	108			33,172			44,660
Interest expense	—			(14,736		)	(28,819		)
Income before gain on sales and income taxes	108			18,436			15,841
Gain on sale of depreciable properties	3,792			1,357,778			1,016
Income from discontinued operations before income taxes	3,900			1,376,214			16,857
Income tax expense	—			(12,465		)	—
Income from discontinued operations	$	3,900		$	1,363,749		$	16,857

Allocation of Common Shareholders' Income (Loss) Between Continuing and Discontinued Operations

The following table illustrates the General Partner's share of the income attributable to common shareholders from continuing operations and discontinued operations, reduced by the allocation of income between continuing and discontinued operations to noncontrolling interests, for the years ended December 31, 2018, 2017 and 2016, respectively (in thousands):

	2018		2017		2016
Income from continuing operations attributable to common shareholders	$	379,865	$	288,075	$	295,452
Income from discontinued operations attributable to common shareholders	3,864		1,346,356		16,691
Net income attributable to common shareholders	$	383,729	$	1,634,431	$	312,143

Schedule of Discontinued Operations, Properties Held-for-Sale, Aggregate Balance Sheet Information

The following table illustrates aggregate balance sheet information for all properties and land held-for-sale (in thousands):

	Held-for-Sale Properties Included in Continuing Operations
	December 31, 2018			December 31, 2017
Land and improvements	$	—		$	8,157
Buildings and tenant improvements	—			10,505
Undeveloped land	1,966			—
Accumulated depreciation	(884		)	(2,553		)
Deferred leasing and other costs, net	—			862
Other assets	—			579
Total assets held-for-sale	$	1,082		$	17,550
Total liabilities held-for-sale	$	—		$	1,163

Asset Impairment Charges [Text Block]

The following table illustrates impairment charges recognized during the years ended December 31, 2018, 2017 and 2016, respectively (in thousands):

	2018		2017		2016
Impairment charges - land	$	—	$	3,622	$	14,299
Impairment charges - building	—		859		3,719
Impairment charges	$	—	$	4,481	$	18,018