Segment Information

12 Months Ended

Dec. 31, 2012

Segment Reporting, Measurement Disclosures [Abstract]

Segment Information

SEGMENT INFORMATION

The Company operates its portfolio of industrial and office properties primarily throughout the Mid-Atlantic, Southeastern, Midwestern and Southwestern United States and the United Kingdom. The Company reviews the performance of the portfolio on a geographical basis. The following are considered the Company's reportable segments.

REGIONS	MARKETS
Northeast	Southeastern PA; Lehigh/Central PA; New Jersey; Maryland
Central	Minnesota; Chicago/Milwaukee; Houston; Arizona
South	Richmond/Hampton Roads; Carolinas; Jacksonville; Orlando; South Florida; Tampa
Metro	Philadelphia; Metro Washington, D.C.
United Kingdom	County of Kent; West Midlands; Cambridge

The Company evaluates the performance of its reportable segments based on net operating income. Net operating income includes operating revenue from external customers, real estate taxes, amortization of lease transaction costs and other operating expenses which relate directly to the management and operation of the assets within each reportable segment.

The Company's accounting policies for the segments are the same as those used in the Company's consolidated financial statements. There are no material inter-segment transactions.

		Year ended
		December 31,
		2012			2011			2010
Operating revenue
	Northeast - Southeastern PA	$	169,645		$	174,063		$	181,412
	Northeast - Lehigh / Central PA	96,804			99,311			103,802
	Northeast - Other	62,823			70,582			74,660
	Central	120,316			126,268			125,501
	South	209,656			222,004			232,071
	Metro	33,360			28,578			28,617
	United Kingdom	4,694			4,408			4,211
Segment-level operating revenue		697,298			725,214			750,274
Reconciliation to total operating revenues
	Discontinued operations	(12,203		)	(62,181		)	(98,090		)
	Other	457			208			(175		)
Total operating revenue		$	685,552		$	663,241		$	652,009
Net operating income
	Northeast - Southeastern PA	$	98,729		$	101,982		$	108,593
	Northeast - Lehigh / Central PA	65,566			64,786			66,632
	Northeast - Other	31,711			35,017			37,234
	Central	63,765			68,114			70,386
	South	126,281			132,703			136,135
	Metro	23,435			19,370			20,713
	United Kingdom	(257		)	(178		)	243
Segment-level net operating income		409,230			421,794			439,936
Reconciliation to income from continuing operations
	Interest expense (1)	(123,146		)	(131,046		)	(149,704		)
	Depreciation/amortization expense (2)	(104,643		)	(106,487		)	(109,265		)
	Gain on property dispositions	4,123			5,025			4,238
	Equity in (loss) earnings of unconsolidated joint ventures	(681		)	3,496			2,296
	General and administrative expense (2)	(40,831		)	(36,140		)	(32,805		)
	Discontinued operations excluding gain on property dispositions	(2,538		)	(10,067		)	(16,378		)
	Income taxes (2)	(874		)	(841		)	(1,606		)
	Other	(6,810		)	(5,673		)	(6,572		)
Income from continuing operations		$	133,830		$	140,061		$	130,140

(1) Includes interest on discontinued operations.

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

The Company's operating revenue by product type and by reportable segment for the years ended December 31, 2012, 2011 and 2010 is as follows (in thousands):

	Year Ended
	December 31, 2012							December 31, 2011							December 31, 2010
	Industrial		Office		Total			Industrial		Office		Total			Industrial		Office		Total
Northeast - Southeastern PA	$	28,604	$	141,041	$	169,645		$	29,290	$	144,773	$	174,063		$	30,515	$	150,897	$	181,412
Northeast - Lehigh / Central PA	94,440		2,364		96,804			93,193		6,118		99,311			91,826		11,976		103,802
Northeast - Other	16,473		46,350		62,823			18,369		52,213		70,582			20,862		53,798		74,660
Central	67,283		53,033		120,316			61,370		64,898		126,268			57,438		68,063		125,501
South	93,346		116,310		209,656			91,439		130,565		222,004			95,123		136,948		232,071
Metro	8,356		25,004		33,360			7,817		20,761		28,578			7,591		21,026		28,617
United Kingdom	1,307		3,387		4,694			1,288		3,120		4,408			1,263		2,948		4,211
	$	309,809	$	387,489	697,298			$	302,766	$	422,448	725,214			$	304,618	$	445,656	750,274
Reconciliation to total operating revenue
Discontinued operations					(12,203		)					(62,181		)					(98,090		)
Other					457							208							(175		)
Total operating revenue					$	685,552						$	663,241						$	652,009

The Company's total assets by reportable segment as of December 31, 2012 and 2011 is as follows (in thousands):

		As of December 31,
		2012		2011
Total assets
	Northeast - Southeastern PA	$	816,437	$	842,779
	Northeast - Lehigh / Central PA	780,182		716,772
	Northeast - Other	388,446		424,005
	Central	1,073,631		991,776
	South	1,455,805		1,448,849
	Metro	478,835		383,725
	United Kingdom	138,025		144,558
	Other	46,610		37,209
Total assets		$	5,177,971	$	4,989,673

The Company's real estate assets by reportable segment as of December 31, 2012 and 2011 is as follows (in thousands):

		As of December 31,
		2012		2011
Real estate assets
	Northeast - Southeastern PA	$	752,423	$	771,022
	Northeast - Lehigh / Central PA	742,464		677,519
	Northeast - Other	358,957		355,022
	Central	1,002,663		843,844
	South	1,375,498		1,288,907
	Metro	313,964		227,931
	United Kingdom	44,861		41,483
Total real estate assets		$	4,590,830	$	4,205,728

The Company incurred the following costs related to its long-lived assets for the years ended December 31, 2012, 2011 and 2010 (in thousands):

		Year Ended December 31,
		2012		2011		2010
Costs incurred on long-lived assets
	Northeast - Southeastern PA	$	11,577	$	14,851	$	9,567
	Northeast - Lehigh / Central PA	86,245		66,472		26,139
	Northeast - Other	10,943		9,232		11,974
	Central	173,142		119,654		28,042
	South	129,705		123,833		53,192
	Metro	94,295		98,193		428
	United Kingdom	6,110		4,838		4,805
Total costs incurred on long-lived assets		$	512,017	$	437,073	$	134,147