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v3.21.2

Vessels (Tables) | 6 Months Ended
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Jun. 30, 2021
Vessels [Abstract] |
Schedule Of Property Plant And Equipment [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Accumulated | ​ | ​ | ​
​ |  | Vessel Cost |  | Depreciation |  | Net Book Value
Balance, December 31, 2020 | ​ | $ | 872,431 | ​ | $ | (156,253) | ​ | $ | 716,178
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
- Additions for improvements | ​ |  | 684 | ​ |  | — | ​ |  | 684
- Additions reclassified from other non-current assets | ​ |  | 441 | ​ |  | ​ | ​ |  | 441
- Transfer to held for sale | ​ |  | (16,121) | ​ |  | 7,111 | ​ |  | (9,010)
- Depreciation for the period | ​ |  | — | ​ |  | (17,474) | ​ |  | (17,474)
Balance, June 30, 2021 | ​ | $ | 857,435 | ​ | $ | (166,616) | ​ | $ | 690,819

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- Definition The movement of the vessels' cost, accumulated depreciation and net book value + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration