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General and Administrative Expense (Tables)
12 Months Ended
Dec. 31, 2016
General and administrative expenses  
General And Administrative Expense
   December 31,
   2014 2015 2016
 Management fees - related party  $8,962 $10,764 $11,611
 Professional fees (legal and accounting)   813  906  528
 Compensation for Directors and Officers   2,004  1,712  1,907
 Listing fees and expenses   87  90  107
 Miscellaneous   1,465  1,145  1,228
 Total  $13,331 $14,617 $15,381