Operating Segments - Profit by Reportable Segment to Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Profit from reportable segments	$ (4,154)	$ (4,558)	$ (5,225)	$ (2,226)	$ 4,020	$ (1,537)	$ 635	$ (3,146)	$ (16,163)	$ (28)	$ (7,652)
Depreciation and amortization									(15,029)	(18,579)	(15,585)
General and administrative									(12,425)	(9,287)	(8,704)
Advisory fee to related party									(11,782)	(8,648)	(8,410)
Other income									2,966	5,113	1,823
Interest income									19,572	18,660	19,607
Interest expense									(24,600)	(29,374)	(31,816)
Loss on foreign currency transactions									(6,175)	(13,378)	(15,108)
Loss on extinguishment of debt									(1,451)	0	(5,219)
Equity in income (loss) from unconsolidated joint ventures									14,531	(519)	(2,758)
Gain on sale or write-down of assets, net									23,352	32,107	14,809
Income tax provision									1,011	(4)	2,000
Net income (loss)									10,077	7,464	(26,137)
Operating segments
Segment Reporting Information [Line Items]
Profit from reportable segments									16,948	27,549	21,018
Other non-segment items of income (expense)
Segment Reporting Information [Line Items]
Depreciation and amortization									(11,870)	(14,755)	(13,379)
General and administrative									(12,425)	(9,287)	(8,704)
Advisory fee to related party									(11,782)	(8,648)	(8,410)
Other income									2,966	5,113	1,823
Interest income									19,572	18,660	19,607
Interest expense									(24,600)	(29,374)	(31,816)
Loss on foreign currency transactions									(6,175)	(13,378)	(15,108)
Loss on extinguishment of debt									(1,451)	0	(5,219)
Equity in income (loss) from unconsolidated joint ventures									14,531	(519)	(2,758)
Gain on sale or write-down of assets, net									23,352	32,107	14,809
Income tax provision									$ 1,011	$ (4)	$ 2,000