Operating Segments (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Total profit from segments	$ 5,065	$ 6,004	$ 15,954	$ 15,630
Depreciation	(3,526)	(3,416)	(10,338)	(9,964)
General and administrative	(1,643)	(1,929)	(7,063)	(6,468)
Advisory fee to related party	(2,139)	(2,200)	(6,483)	(6,196)
Interest income	4,348	5,232	13,102	14,668
Other income	706	1,990	3,885	7,394
Interest expense	(6,291)	(8,037)	(21,999)	(23,642)
(Loss) gain on foreign currency transaction	(1,470)	(5,153)	774	(13,296)
Loss on extinguishment of debt		(5,219)		(5,219)
Income (losses) from unconsolidated joint ventures	365	(178)	(740)	(1,474)
Gain on sales or write-down of assets	12,328	5,140	21,802	9,409
Income tax expense	(50)		(346)
Net income (loss)	$ 7,693	$ (7,766)	$ 8,548	$ (19,158)