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General and Administrative Expense (Tables)
 12 Months Ended
Dec. 31, 2018
General and Administrative Expense [Abstract]  
General and Administrative Expense
General and administrative expenses for the years ended December 31, 2016, 2017 and 2018 were as follows:

 
 
December 31,
 
 
2016
 
2017
 
2018
Management fees – related parties
 
$
11,611

 
$
13,511

 
$
16,536

Professional fees (legal and accounting)
 
528

 
687

 
833

Compensation for Directors and Officers
 
1,907

 
468

 
477

Listing fees and expenses
 
107

 
96

 
115

Miscellaneous
 
1,228

 
1,356

 
1,281

Total
 
$
15,381

 
$
16,118

 
$
19,242