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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

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