Discontinued Operations and Assets Held for Sale (Tables)

3 Months Ended

Mar. 31, 2015

Discontinued Operations and Disposal Groups [Abstract]

Table Illustration of Number of Properties in Discontinued Operations

	Held-for-Sale at March 31, 2015	Sold through March 31, 2015	Sold in 2014	Total
Industrial	5	0	11	16
Office	56	0	0	56
Medical Office	0	1	1	2
Total properties included in discontinued operations	61	1	12	74
Properties excluded from discontinued operations	52	11	17	80
Total properties sold or classified as held-for-sale	113	12	29	154

Table Illustration of Discontinued Operations in Statement of Operations

	Three Months Ended March 31,
	2015			2014
Revenues	$	32,115		$	30,072
Operating expenses	(12,386		)	(12,403		)
Depreciation and amortization	(3,517		)	(9,966		)
Operating income	16,212			7,703
Interest expense	(6,034		)	(6,378		)
Income before gain on sales	10,178			1,325
Gain on sale of depreciable properties	18,375			19,752
Income from discontinued operations before income taxes	28,553			21,077
Income tax expense	—			(2,977		)
Income from discontinued operations	$	28,553		$	18,100

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

	Three Months Ended March 31,
	2015		2014
Income from continuing operations attributable to common shareholders	$	36,994	$	823
Income from discontinued operations attributable to common shareholders	28,250		17,860
Net income attributable to common shareholders	$	65,244	$	18,683

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

The following table illustrates aggregate balance sheet information at March 31, 2015 and December 31, 2014 (in thousands):

	March 31, 2015									December 31, 2014
	Properties Included in Continuing Operations			Properties Included in Discontinued Operations			Total Held-For-Sale Properties			Properties Included in Continuing Operations			Properties Included in Discontinued Operations			Total  Held-For-Sale Properties
Land and improvements	$	36,236		$	121,149		$	157,385		$	21,347		$	126,921		$	148,268
Buildings and tenant improvements	168,893			702,820			871,713			36,925			721,398			758,323
Undeveloped land	13,736			—			13,736			12,443			—			12,443
Accumulated depreciation	(51,217		)	(234,132		)	(285,349		)	(23,071		)	(247,269		)	(270,340		)
Deferred leasing and other costs, net	6,626			42,152			48,778			3,480			44,840			48,320
Other assets	5,896			27,859			33,755			562			27,475			28,037
Total assets held-for-sale	$	180,170		$	659,848		$	840,018		$	51,686		$	673,365		$	725,051
Secured debt	$	1,097		$	40,600		$	41,697		$	—		$	40,764		$	40,764
Accrued expenses	4,685			6,934			11,619			233			5,180			5,413
Other liabilities	2,228			9,561			11,789			434			12,481			12,915
Total liabilities held-for-sale	$	8,010		$	57,095		$	65,105		$	667		$	58,425		$	59,092