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General and Administrative Expense, detail (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
General and Administrative Expense [Abstract]      
Management fees – related parties $ 16,536 $ 13,511 $ 11,611
Professional fees (legal and accounting) 833 687 528
Compensation for Directors and Officers 477 468 1,907
Listing fees and expenses 115 96 107
Miscellaneous 1,281 1,356 1,228
Total $ 19,242 $ 16,118 $ 15,381