Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Revenues
Rental Operations:
Industrial	$	135,487	$	128,263	$	283,115	$	261,554
Medical Office	40,274		34,954		80,302		68,264
Office	23,691		38,586		48,826		77,565
Non-reportable Rental Operations	—		1,629		—		3,716
Service Operations	23,901		69,512		76,722		125,332
Total segment revenues	223,353		272,944		488,965		536,431
Other revenue	2,544		1,348		4,368		2,327
Consolidated revenue from continuing operations	225,897		274,292		493,333		538,758
Discontinued operations	49		29,331		32,164		59,403
Consolidated revenue	$	225,946	$	303,623	$	525,497	$	598,161

Summary of Net Operation Income

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
PNOI
Industrial	$	99,408		$	87,897		$	195,456		$	172,056
Medical Office	25,820			22,015			51,051			42,592
Office	12,885			13,611			25,166			25,525
Non-reportable Rental Operations	—			1,300			—			2,405
PNOI, excluding all sold/held for sale properties	138,113			124,823			271,673			242,578
PNOI from sold/held-for-sale properties included in continuing operations	2,751			16,306			11,463			31,602
PNOI, continuing operations	140,864			141,129			283,136			274,180
Earnings from Service Operations	2,163			5,655			7,960			14,204
Rental Operations revenues and expenses excluded from PNOI:
Straight-line rental income and expense, net	3,956			4,077			11,107			9,778
Revenues related to lease buyouts	94			1,525			958			4,220
Amortization of lease concessions and above and below market rents	(490		)	(1,389		)	(2,203		)	(3,600		)
Intercompany rents and other adjusting items	(412		)	(1,355		)	(872		)	(2,497		)
Non-Segment Items:
Equity in earnings of unconsolidated companies	15,123			60,826			21,369			63,147
Interest expense	(42,976		)	(51,448		)	(92,567		)	(103,306		)
Depreciation expense	(78,334		)	(88,500		)	(160,237		)	(176,798		)
Gain on sale of properties	107,410			70,318			130,894			86,171
Impairment charges on non-depreciable properties	(5,470		)	(2,523		)	(5,470		)	(2,523		)
Interest and other income, net	1,375			229			1,713			580
General and administrative expenses	(19,238		)	(10,365		)	(36,242		)	(25,059		)
Gain on land sales	17,012			3,889			22,437			4,041
Other operating expenses	(1,555		)	(1,987		)	(3,112		)	(4,203		)
Loss on extinguishment of debt	(82,653		)	(139		)	(82,653		)	(139		)
Acquisition-related activity	(1,305		)	(747		)	(1,333		)	(761		)
Other non-segment revenues and expenses, net	143			(80		)	(259		)	(772		)
Income from continuing operations before income taxes	$	55,707		$	129,115		$	94,626		$	136,663

Reportable Segments Consolidated Assets

	June 30, 2015		December 31, 2014
Assets
Rental Operations:
Industrial	$	4,510,800	$	4,677,047
Medical Office	1,226,567		1,229,632
Office	654,467		1,252,627
Non-reportable Rental Operations	—		71,741
Service Operations	136,614		158,762
Total segment assets	6,528,448		7,389,809
Non-segment assets	586,073		365,030
Consolidated assets	$	7,114,521	$	7,754,839