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