Discontinued Operations and Assets Held for Sale (Tables)

12 Months Ended

Dec. 31, 2015

Discontinued Operations and Disposal Groups [Abstract]

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, 2015	Sold in 2015	Sold in 2014	Sold in 2013	Total
Office	0	56	0	12	68
Industrial	0	5	11	6	22
Medical Office	0	1	1	6	8
Retail	0	0	0	1	1
Total properties included in discontinued operations	0	62	12	25	99
Properties excluded from discontinued operations	4	91	17	13	125
Total properties sold or classified as held-for-sale	4	153	29	38	224

Table Illustration of Discontinued Operations in Income Statement

The following table illustrates the operations of the buildings reflected in discontinued operations for the years ended December 31, 2015, 2014 and 2013, respectively (in thousands):

	2015			2014			2013
Revenues	$	32,549		$	120,884		$	159,096
Operating expenses	(12,498		)	(47,123		)	(62,048		)
Depreciation and amortization	(3,517		)	(38,342		)	(55,594		)
Operating income	16,534			35,419			41,454
Interest expense	(5,595		)	(24,348		)	(37,649		)
Income before gain on sales	10,939			11,071			3,805
Gain on sale of depreciable properties	424,892			22,763			133,242
Income from discontinued operations before income taxes	435,831			33,834			137,047
Income tax expense	(3,175		)	(2,969		)	—
Income from discontinued operations	$	432,656		$	30,865		$	137,047

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

The following table illustrates the General Partner's share of the income (loss) attributable to common shareholders from continuing operations and discontinued operations, reduced by the allocation of income or loss between continuing and discontinued operations to noncontrolling interests, for the years ended December 31, 2015, 2014 and 2013, respectively (in thousands):

	2015		2014		2013
Income from continuing operations attributable to common shareholders	$	187,099	$	174,419	$	21,109
Income from discontinued operations attributable to common shareholders	428,211		30,474		131,935
Net income attributable to common shareholders	$	615,310	$	204,893	$	153,044

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

The following table illustrates aggregate balance sheet information of these held-for-sale properties (in thousands):

	December 31, 2015			December 31, 2014
	Held-for-Sale Properties Included in Continuing Operations			Properties Included in Continuing Operations			Properties Included in Discontinued Operations			Total  Held-For-Sale Properties
Land and improvements	$	9,797		$	21,347		$	126,921		$	148,268
Buildings and tenant improvements	39,480			36,925			721,398			758,323
Undeveloped land	—			12,443			—			12,443
Accumulated depreciation	(7,183		)	(23,071		)	(247,269		)	(270,340		)
Deferred leasing and other costs, net	3,293			3,480			44,840			48,320
Other assets	414			562			27,475			28,037
Total assets held-for-sale	$	45,801		$	51,686		$	673,365		$	725,051
Secured debt	$	—		$	—		$	40,764		$	40,764
Accrued expenses	322			233			5,180			5,413
Other liabilities	650			434			12,481			12,915
Total liabilities held-for-sale	$	972		$	667		$	58,425		$	59,092

Asset Impairment Charges [Text Block]

The following table illustrates impairment charges recognized during the years ended December 31, 2015 and 2014, respectively (in thousands):

	2015		2014		2013
Impairment charges - land	$	19,526	$	33,700	$	3,777
Impairment charges - building	3,406		15,406		—
Impairment charges	$	22,932	$	49,106	$	3,777