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Accounts and Notes Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts and notes receivable at December 31, 2017 and 2016 are summarized as follows:

 
2017
 
2016
Trade
$
51,416

 
$
31,958

Notes
4,031

 
2,959

Straight-line rent and recoveries
33,356

 
29,568

 
$
88,803

 
$
64,485

Less: Allowance for doubtful accounts
(10,237
)
 
(4,311
)
 
$
78,566

 
$
60,174