Segment Information (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

The following tables summarize the rental and other revenues and net operating income, the primary industry property-level performance metric used by our chief operating decision maker and which is defined as rental and other revenues less rental property and other expenses, for each of our reportable segments.

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Rental and Other Revenues:
Office:
Atlanta	$	35,347	$	34,652	$	69,556	$	67,848
Greensboro	5,284		5,037		10,586		10,184
Memphis	11,823		11,931		23,618		23,945
Nashville	28,836		24,415		52,526		47,781
Orlando	12,436		11,197		24,874		22,682
Pittsburgh	14,852		14,195		29,701		29,335
Raleigh	30,097		28,024		59,643		56,246
Richmond	11,106		10,937		22,048		22,006
Tampa	24,250		22,814		47,506		44,252
Total Office Segment	174,031		163,202		340,058		324,279
Other	3,252		3,658		6,633		7,440
Total Rental and Other Revenues	$	177,283	$	166,860	$	346,691	$	331,719

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Net Operating Income:
Office:
Atlanta	$	22,544		$	21,911		$	44,550		$	42,963
Greensboro	3,391			3,209			6,749			6,357
Memphis	7,272			7,398			14,544			14,813
Nashville	21,626			17,613			38,250			34,428
Orlando	7,430			6,320			15,008			13,005
Pittsburgh	8,949			8,108			17,574			16,711
Raleigh	21,920			20,156			43,385			40,410
Richmond	7,845			7,687			15,466			15,116
Tampa	15,203			14,361			30,325			27,688
Total Office Segment	116,180			106,763			225,851			211,491
Other	2,249			2,582			4,590			5,133
Total Net Operating Income	118,429			109,345			230,441			216,624
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates:
Depreciation and amortization	(55,816		)	(55,317		)	(111,961		)	(108,811		)
General and administrative expenses	(9,050		)	(8,327		)	(20,540		)	(19,464		)
Interest expense	(16,154		)	(19,485		)	(34,017		)	(40,190		)
Other income	1,390			534			2,074			1,051
Income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates	$	38,799		$	26,750		$	65,997		$	49,210