Discontinued Operations and Assets Held for Sale (Tables)

6 Months Ended

Jun. 30, 2015

Discontinued Operations and Disposal Groups [Abstract]

Table Illustration of Number of Properties in Discontinued Operations

	Held-for-Sale at June 30, 2015	Sold through June 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	9	62	17	88
Total properties sold or classified as held-for-sale	9	124	29	162

Table Illustration of Discontinued Operations in Statement of Operations

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Revenues	$	49		$	29,331		$	32,164		$	59,403
Operating expenses	(13		)	(11,101		)	(12,399		)	(23,504		)
Depreciation and amortization	—			(9,141		)	(3,517		)	(19,107		)
Operating income	36			9,089			16,248			16,792
Interest expense	—			(3,618		)	(6,053		)	(7,399		)
Income before gain on sales	36			5,471			10,195			9,393
Gain on sale of depreciable properties	399,354			2,851			417,729			22,603
Income from discontinued operations before income taxes	399,390			8,322			427,924			31,996
Income tax expense	(3,220		)	(546		)	(3,220		)	(3,523		)
Income from discontinued operations	$	396,170		$	7,776		$	424,704		$	28,473

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Income from continuing operations attributable to common shareholders	$	57,333	$	120,013	$	94,382	$	118,272
Income from discontinued operations attributable to common shareholders	392,047		7,675		420,242		28,099
Net income attributable to common shareholders	$	449,380	$	127,688	$	514,624	$	146,371

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 June 30, 2015 and December 31, 2014 (in thousands):

	June 30, 2015			December 31, 2014
	Properties Included in Continuing Operations			Properties Included in Continuing Operations			Properties Included in Discontinued Operations			Total  Held-For-Sale Properties
Land and improvements	$	13,443		$	21,347		$	126,921		$	148,268
Buildings and tenant improvements	94,443			36,925			721,398			758,323
Undeveloped land	2,696			12,443			—			12,443
Accumulated depreciation	(46,891		)	(23,071		)	(247,269		)	(270,340		)
Deferred leasing and other costs, net	4,393			3,480			44,840			48,320
Other assets	4,300			562			27,475			28,037
Total assets held-for-sale	$	72,384		$	51,686		$	673,365		$	725,051
Secured debt	$	—		$	—		$	40,764		$	40,764
Accrued expenses	1,885			233			5,180			5,413
Other liabilities	1,857			434			12,481			12,915
Total liabilities held-for-sale	$	3,742		$	667		$	58,425		$	59,092