Accounting for the Impairment or Disposal of Long-Lived Assets (Tables)

12 Months Ended

Dec. 31, 2016

Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract]

Schedule of Operating Properties

Information on the operating properties the Company sold during the years ended December 31, 2016 and 2015 is as follows:

2016 Sales

Reportable Segment	Number of Buildings	Acres of Developable Land (unaudited)	Leaseable Square Feet (unaudited)	Gross Proceeds (in thousands)
Chicago/Milwaukee	1	5	171,114	$	10,625
Florida	51	12	3,509,641	505,828
Lehigh/Central PA	1	—	120,777	11,200
Minnesota	23	—	1,866,161	189,200
Philadelphia	—	1	—	2,640
Southeastern PA	31	—	2,165,002	266,821
Other	18	18	1,631,295	224,241
Total	125	36	9,463,990	$	1,210,555

2015 Sales

Reportable Segment	Number of Buildings	Acres of Developable Land (unaudited)	Leaseable Square Feet (unaudited)	Gross Proceeds (in thousands)
Carolinas/Richmond	22	3	1,319,299	$	110,054
Florida	4	—	874,125	55,425
Minnesota	2	—	222,642	25,700
Southeastern PA	46	20	2,724,489	316,583
Other	7	—	569,618	37,371
Total	81	23	5,710,173	$	545,133

A summary of the results of operations for the properties classified as discontinued operations through the respective disposition dates is as follows (in thousands):

	For the Year Ended
	December 31, 2014
Revenues	$	4,728
Operating expenses	(2,258		)
Interest and other income	37
Interest expense	(557		)
Depreciation and amortization	—
Income before gain on property dispositions	1,950
Gain on property dispositions	46,631
Net income	$	48,581

Significant Sale

A summary of net income (excluding gain on sale) related to this portfolio is as follows (in thousands):

	Year Ended December 31,
	2016			2015			2014
Net income	$	48,609		$	58,792		$	51,898
Noncontrolling interest - operating partnership	(1,142		)	(1,370		)	(1,220		)
Income available to common shareholders	$	47,467		$	57,422		$	50,678

Asset Impairment Charges

The impairment losses are for operating properties or land parcels and were in the reportable segments and for the amounts as indicated below (in thousands):

	Year Ended December 31,
Reportable Segment	2016		2015		2014
Carolinas/Richmond	$	—	$	13,755	$	—
Minnesota	3,879		—		—
Southeastern PA	—		2,328		106
Other	—		2,161		11
Total	$	3,879	$	18,244	$	117