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Acquisitions, Dispositions, Impairment, and Discontinued operations (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Line Items]  
Disposal Groups, Including Discontinued Operations [Table Text Block]
The following is a summary of income from discontinued operations for the years ended December 31, 2016 and 2015 relating to the 15 operating properties and the retail center sold in April 2016:

 
Years Ended December 31,
(in thousands)
2016
 
2015
Property revenues
$
19,184

 
$
57,310

Property expenses
(6,898
)
 
(20,716
)
 
$
12,286

 
$
36,594

Property management expense
(242
)
 
(706
)
Depreciation and amortization
(4,327
)
 
(16,138
)
Income tax expense
(112
)
 
—

Income from discontinued operations
$
7,605

 
$
19,750

Gain on sale of discontinued operations, net of tax
$
375,237

 
$
—