Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The operating information by reportable segment is as follows (in thousands):



		Year ended
		December 31,
		2015			2014			2013
Operating revenue
	Carolinas	$	40,917		$	35,870		$	30,243
	Chicago/Milwaukee	37,431			33,068			18,083
	Houston	54,031			49,309			37,773
	Lehigh/Central PA	133,473			118,145			101,101
	Minnesota	47,932			54,892			62,415
	Orlando	21,802			32,674			31,400
	Philadelphia	40,490			35,238			31,690
	Richmond/Hampton Roads	31,033			40,911			40,247
	South Florida	50,638			48,804			38,464
	Southeastern PA	147,712			148,714			165,248
	Tampa	54,744			53,725			52,230
	United Kingdom	15,135			16,360			7,669
	Other	133,345			130,013			142,402
Segment-level operating revenue		808,683			797,723			758,965

Reconciliation to total operating revenues
	Discontinued operations	—			(4,728		)	(113,586		)
	Other	90			(364		)	551
Total operating revenue		$	808,773		$	792,631		$	645,930

Net operating income
	Carolinas	$	28,594		$	24,578		$	20,434
	Chicago/Milwaukee	24,851			20,856			11,726
	Houston	31,159			29,134			22,632
	Lehigh/Central PA	94,972			82,050			68,504
	Minnesota	20,112			26,464			30,016
	Orlando	14,842			21,472			20,506
	Philadelphia	29,679			26,722			23,587
	Richmond/Hampton Roads	19,255			24,357			24,063
	South Florida	28,308			27,947			20,943
	Southeastern PA	80,458			81,183			91,193
	Tampa	34,133			33,776			33,042
	United Kingdom	10,486			10,704			2,597
	Other	87,925			83,991			81,435
Segment-level net operating income		504,774			493,234			450,678

Reconciliation to income from continuing operations
	Interest expense ⁽¹⁾	(135,779		)	(152,444		)	(143,018		)
	Depreciation/amortization expense ^{(1) (2)}	(166,500		)	(177,715		)	(138,128		)
	Impairment - real estate assets	(18,244		)	(117		)	(248		)
	Gain on property dispositions	100,314			45,147			—
	Equity in earnings of unconsolidated joint ventures	3,149			10,314			6,067
	General and administrative expense ^{(1) (2)}	(44,529		)	(38,041		)	(50,998		)
	Discontinued operations excluding gain on property dispositions	—			(1,950		)	(26,455		)
	Income taxes ⁽²⁾	(2,911		)	(2,781		)	(2,748		)
	Other	4,172			(65		)	2,605
Income from continuing operations		$	244,446		$	175,582		$	97,755

(1) Includes activity on discontinued operations.

(2) Excludes costs which are included in determining segment-level net operating income.

Schedule of Segment Reporting Information, by Segment, Depreciation and Amortization [Table Text Block]

The amount of depreciation and amortization expense related to tenant improvement and lease transaction costs within each reporting segment for the Net operating income calculation is as follows (in thousands):



	Year ended
	December 31,
	2015		2014		2013
Carolinas	$	2,413	$	2,329	$	1,935
Chicago/Milwaukee	1,161		466		251
Houston	4,466		3,988		3,200
Lehigh/Central PA	11,641		10,157		9,781
Minnesota	4,986		4,478		5,797
Orlando	1,963		3,116		3,037
Philadelphia	2,220		1,803		1,729
Richmond/Hampton Roads	2,894		4,278		4,156
South Florida	3,572		2,824		2,979
Southeastern PA	12,346		12,272		15,040
Tampa	3,872		3,384		3,033
United Kingdom	292		177		172
Other	8,249		5,631		13,439
Depreciation and amortization of tenant improvement and lease transaction costs	$	60,075	$	54,903	$	64,549

Revenue from External Customers by Products and Services [Table Text Block]

The Company's operating revenue by product type and by reportable segment for the years ended December 31, 2015, 2014 and 2013 is as follows (in thousands):



	Year Ended
	December 31, 2015						December 31, 2014							December 31, 2013
	Industrial		Office		Total		Industrial		Office		Total			Industrial		Office		Total
Carolinas	$	40,917	$	—	$	40,917	$	35,870	$	—	$	35,870		$	30,243	$	—	$	30,243
Chicago/Milwaukee	37,431		—		37,431		33,068		—		33,068			18,083		—		18,083
Houston	53,802		229		54,031		49,309		—		49,309			37,773		—		37,773
Lehigh/Central PA	131,168		2,305		133,473		115,821		2,324		118,145			98,715		2,386		101,101
Minnesota	24,721		23,211		47,932		25,378		29,514		54,892			32,043		30,372		62,415
Orlando	20,056		1,746		21,802		18,635		14,039		32,674			16,535		14,865		31,400
Philadelphia	11,809		28,681		40,490		10,072		25,166		35,238			9,534		22,156		31,690
Richmond/Hampton Roads	21,158		9,875		31,033		20,924		19,987		40,911			19,073		21,174		40,247
South Florida	20,740		29,898		50,638		18,603		30,201		48,804			7,955		30,509		38,464
Southeastern PA	28,457		119,255		147,712		28,895		119,819		148,714			27,076		138,172		165,248
Tampa	26,353		28,391		54,744		25,451		28,274		53,725			24,331		27,899		52,230
United Kingdom	12,104		3,031		15,135		13,090		3,270		16,360			4,205		3,464		7,669
Other ⁽¹⁾	86,180		47,165		133,345		82,672		47,341		130,013			43,355		99,047		142,402
	$	514,896	$	293,787	808,683		$	477,788	$	319,935	797,723			$	368,921	$	390,044	758,965
Reconciliation to total operating revenue
Discontinued operations					—						(4,728		)					(113,586		)
Corporate other					90						(364		)					551
Total operating revenue					$	808,773					$	792,631						$	645,930


(1)	A substantial portion of the buildings contributing to office operating revenue in 2013 were sold in conjunction with the Portfolio Sale. See Footnote 19.

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

The Company's total assets by reportable segment as of December 31, 2015 and 2014 is as follows (in thousands):



	As of December 31,
	2015		2014
Carolinas	$	338,273	$	325,690
Chicago/Milwaukee	429,390		422,531
Houston	522,285		418,154
Lehigh/Central PA	1,157,468		1,023,641
Minnesota	346,840		333,506
Orlando	138,181		160,899
Philadelphia	444,889		366,243
Richmond/Hampton Roads	128,825		250,205
South Florida	409,501		400,034
Southeastern PA	448,523		698,163
Tampa	326,670		335,652
United Kingdom	215,850		231,271
Other	1,586,481		1,553,250
Segment-level total assets	6,493,176		6,519,239
Corporate Other	64,453		92,775
Total assets	$	6,557,629	$	6,612,014

Schedule of Long-Lived Assets, by Geographical Areas [Table Text Block]

The Company's real estate assets by reportable segment as of December 31, 2015 and 2014 is as follows (in thousands):



	As of December 31,
	2015		2014
Carolinas	$	322,707	$	309,822
Chicago/Milwaukee	387,182		383,494
Houston	483,432		398,080
Lehigh/Central PA	1,096,195		958,886
Minnesota	322,627		302,830
Orlando	119,356		139,218
Philadelphia	282,159		255,313
Richmond/Hampton Roads	123,641		238,670
South Florida	389,534		378,398
Southeastern PA	410,195		636,280
Tampa	306,822		317,106
United Kingdom	174,390		182,588
Other	1,447,322		1,391,744
Total real estate assets	$	5,865,562	$	5,892,429

Schedule of Expenditures on Long-Lived Assets [Table Text Block]

The Company incurred the following costs related to its long-lived assets for the years ended December 31, 2015, 2014 and 2013 (in thousands):



		Year Ended December 31,
		2015		2014		2013
Costs incurred on long-lived assets
	Carolinas	$	21,993	$	72,252	$	15,582
	Chicago/Milwaukee	13,483		21,698		248,640
	Houston	96,681		70,903		116,024
	Lehigh/Central PA	165,319		105,725		161,925
	Minnesota	41,259		28,966		38,434
	Orlando	5,344		7,827		10,953
	Philadelphia	34,122		32,012		17,941
	Richmond/Hampton Roads	9,182		10,348		15,880
	South Florida	34,089		30,063		148,165
	Southeastern PA	9,047		39,638		39,590
	Tampa	4,161		7,262		28,655
	United Kingdom	12,960		16,298		155,829
	Other	125,412		172,495		897,831
Total costs incurred on long-lived assets		$	573,052	$	615,487	$	1,895,449