Operating Segments - Profit by Reportable Segment to Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total profit from segments	$ (3,033)	$ (8,771)	$ (7,528)	$ (11,773)
Depreciation and amortization	(2,298)	(3,211)	(4,647)	(6,538)
General and administrative	(2,194)	(5,866)	(4,914)	(9,101)
Advisory fee to related party	(2,858)	(5,739)	(6,043)	(8,175)
Other income	870	909	1,176	2,376
Interest income	9,419	5,616	16,201	11,260
Interest expense	(6,389)	(7,681)	(12,556)	(15,419)
Gain (loss) on foreign currency transaction			17,904	2,824
Loss on extinguishment of debt	0	0	(1,639)	0
Income from unconsolidated joint ventures	2,048	4,572	7,242	7,908
Gain (loss) on sales or write-down of assets	3,893	(24,445)	15,041	(7,047)
Income tax provision	(40)	1,841	(68)	1,801
Net income (loss)	20,030	(33,661)	34,597	(10,446)
Operating segments
Segment Reporting Information [Line Items]
Total profit from segments	3,447	5,136	6,900	9,665
Other non-segment items of income (expense)
Segment Reporting Information [Line Items]
Depreciation and amortization	(2,298)	(3,211)	(4,647)	(6,538)
General and administrative	(2,194)	(5,866)	(4,914)	(9,101)
Advisory fee to related party	(2,858)	(5,739)	(6,043)	(8,175)
Other income	870	909	1,176	2,376
Interest income	9,419	5,616	16,201	11,260
Interest expense	(6,389)	(7,681)	(12,556)	(15,419)
Gain (loss) on foreign currency transaction	14,132	(4,793)	17,904	2,824
Loss on extinguishment of debt	0	0	(1,639)	0
Income from unconsolidated joint ventures	2,048	4,572	7,242	7,908
Gain (loss) on sales or write-down of assets	3,893	(24,445)	15,041	(7,047)
Income tax provision	(40)	1,841	(68)	1,801
Net income (loss)	$ 20,030	$ (33,661)	$ 34,597	$ (10,446)