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Mortgages and Notes Payable (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Consolidated Mortgages and Notes Payable [Table Text Block]
The following table sets forth our mortgages and notes payable:
 
 
June 30,
2017
 
December 31,
2016
Secured indebtedness
$
99,856

 
$
128,204

Unsecured indebtedness
1,913,966

 
1,826,145

Less-unamortized debt issuance costs
(8,784
)
 
(6,302
)
Total mortgages and notes payable, net
$
2,005,038

 
$
1,948,047