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Notes and Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Components of notes and accounts receivables
At December 31, 2017 and 2016, notes and accounts receivables included the following (in thousands):
 
2017
 
2016
Notes receivable
$
465

 
$
3,921

Allowance for doubtful accounts related to notes receivable
—

 
(414
)
Tenant and other receivables
14,490

 
24,929

Allowance for doubtful accounts related to tenant and other receivables
(535
)
 
(753
)
 
$
14,420

 
$
27,683