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Operating Segments - Profit by Reportable Segment to Net Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Total profit from segments $ (3,002) $ (3,238)
Depreciation (3,953) (4,325)
General and administrative (3,235) (4,292)
Advisory fee to related party (2,436) (2,373)
Other income 1,467 1,688
Interest income 5,644 5,754
Interest expense (7,738) (9,602)
Gain on foreign currency transaction 7,617 7,843
Equity in income (loss) from unconsolidated joint ventures 3,336 (260)
Gain on sales or write-down of assets 17,398 4,138
Income tax expense (40) (247)
Net income 23,215 4,388
Operating segments    
Segment Reporting Information [Line Items]    
Total profit from segments 4,529 5,133
Other non-segment items of income (expense)    
Segment Reporting Information [Line Items]    
Depreciation (3,327) (3,394)
General and administrative (3,235) (4,292)
Advisory fee to related party (2,436) (2,373)
Other income 1,467 1,688
Interest income 5,644 5,754
Interest expense (7,738) (9,602)
Gain on foreign currency transaction 7,617 7,843
Equity in income (loss) from unconsolidated joint ventures 3,336 (260)
Gain on sales or write-down of assets 17,398 4,138
Income tax expense (40) (247)
Net income $ 23,215 $ 4,388