Operating Segments - Profit by Reportable Segment to Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total profit from segments	$ (1,277)	$ (3,859)	$ (2,794)	$ (6,945)
Other non-segment items of income (expense)
Depreciation and amortization	(3,137)	(3,200)	(6,309)	(6,302)
General and administrative	(1,552)	(3,684)	(2,960)	(6,845)
Advisory fee to related party	(1,737)	(2,183)	(3,939)	(4,588)
Other income	585	850	1,205	1,529
Interest income	4,794	7,898	10,527	16,193
Interest expense	(1,913)	(2,480)	(3,835)	(5,620)
Gain on foreign currency transaction	0	22	0	993
Loss on early extinguishment of debt	0	(1,710)	0	(1,710)
Income from unconsolidated joint ventures	501	293	984	2,712
Gain on sale or write-down of assets, net	0	188	0	188
Income tax provision	(614)	(49)	(1,089)	(1,289)
Net income	1,491	303	3,793	4,522
Operating Segments
Segment Reporting Information [Line Items]
Total profit from segments	4,564	4,358	9,209	9,261
Other non-segment items of income (expense)
Other non-segment items of income (expense)
Depreciation and amortization	(3,137)	(3,200)	(6,309)	(6,302)
General and administrative	(1,552)	(3,684)	(2,960)	(6,845)
Advisory fee to related party	(1,737)	(2,183)	(3,939)	(4,588)
Other income	585	850	1,205	1,529
Interest income	4,794	7,898	10,527	16,193
Interest expense	(1,913)	(2,480)	(3,835)	(5,620)
Gain on foreign currency transaction	0	22	0	993
Loss on early extinguishment of debt	0	(1,710)	0	(1,710)
Income from unconsolidated joint ventures	501	293	984	2,712
Gain on sale or write-down of assets, net	0	188	0	188
Income tax provision	(614)	(49)	(1,089)	(1,289)
Net income	$ 1,491	$ 303	$ 3,793	$ 4,522