Operating Segments - Profit by Reportable Segment to Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Total profit from segments	$ (4,495)	$ (3,002)
General and administrative	(2,720)	(3,235)
Advisory fee to related party	(3,185)	(2,436)
Other income	306	1,467
Interest income	6,782	5,644
Interest expense	(6,167)	(7,738)
Gain on foreign currency transaction	3,772	7,617
Loss on extinguishment of debt	(1,639)	0
Income from unconsolidated joint ventures	5,194	3,336
Gain on sales or write-down of assets	11,148	17,398
Income tax provision	(28)	(40)
Net income	14,567	23,215
Operating segments
Segment Reporting Information [Line Items]
Total profit from segments	3,453	4,529
Other non-segment items of income (expense)
Segment Reporting Information [Line Items]
Depreciation	(2,349)	(3,327)
General and administrative	(2,720)	(3,235)
Advisory fee to related party	(3,185)	(2,436)
Other income	306	1,467
Interest income	6,782	5,644
Interest expense	(6,167)	(7,738)
Gain on foreign currency transaction	3,772	7,617
Loss on extinguishment of debt	(1,639)	0
Income from unconsolidated joint ventures	5,194	3,336
Gain on sales or write-down of assets	11,148	17,398
Income tax provision	(28)	(40)
Net income	$ 14,567	$ 23,215