Discontinued Operations and Assets Held for Sale (Tables)

9 Months Ended

Sep. 30, 2015

Discontinued Operations and Disposal Groups [Abstract]

Table Illustration of Number of Properties in Discontinued Operations

	Held-for-Sale at September 30, 2015	Sold through September 30, 2015	Sold in 2014	Total
Industrial	0	5	11	16
Medical Office	0	1	1	2
Office	0	56	0	56
Total properties included in discontinued operations	0	62	12	74
Properties excluded from discontinued operations	1	78	17	96
Total properties sold or classified as held-for-sale	1	140	29	170

Table Illustration of Discontinued Operations in Statement of Operations

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Revenues	$	7		$	29,709		$	32,171		$	89,112
Operating expenses	(50		)	(12,145		)	(12,449		)	(35,651		)
Depreciation and amortization	—			(9,228		)	(3,517		)	(28,335		)
Operating income	(43		)	8,336			16,205			25,126
Interest expense	—			(6,059		)	(5,659		)	(18,557		)
Income (loss) before gain on sales	(43		)	2,277			10,546			6,569
Gain on sale of depreciable properties	66			564			417,795			22,864
Income from discontinued operations before income taxes	23			2,841			428,341			29,433
Income tax benefit (expense)	45			555			(3,175		)	(2,969		)
Income from discontinued operations	$	68		$	3,396		$	425,166		$	26,464

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Income from continuing operations attributable to common shareholders	$	76,367	$	58,180	$	170,294	$	181,783
Income from discontinued operations attributable to common shareholders	67		3,353		420,764		26,121
Net income attributable to common shareholders	$	76,434	$	61,533	$	591,058	$	207,904

Schedule of Discontinued Operations, Properties Held-for-Sale, Aggregate Balance Sheet Information [Table Text Block]

The following table illustrates aggregate balance sheet information for all held-for-sale properties at September 30, 2015 and December 31, 2014 (in thousands):

	September 30, 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	$	596		$	21,347		$	126,921		$	148,268
Buildings and tenant improvements	8,039			36,925			721,398			758,323
Undeveloped land	6,349			12,443			—			12,443
Accumulated depreciation	(6,283		)	(23,071		)	(247,269		)	(270,340		)
Deferred leasing and other costs, net	67			3,480			44,840			48,320
Other assets	152			562			27,475			28,037
Total assets held-for-sale	$	8,920		$	51,686		$	673,365		$	725,051
Secured debt	$	—		$	—		$	40,764		$	40,764
Accrued expenses	183			233			5,180			5,413
Other liabilities	42			434			12,481			12,915
Total liabilities held-for-sale	$	225		$	667		$	58,425		$	59,092