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General and Administrative Expense, Detail (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
General and Administrative Expense [Abstract]      
Management fees – related parties $ 18,050 $ 16,536 $ 13,511
Professional fees (legal and accounting) 720 833 687
Directors fess and expenses 468 477 468
Listing fees and expenses 97 115 96
Miscellaneous 1,304 1,281 1,356
Total $ 20,639 $ 19,242 $ 16,118