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Vessels in Operation (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Schedule of Vessels in Operation, Less Accumulated Depreciation |
| Vessel Cost, as adjusted for |  | Accumulated |  | Net Book
| impairment charges |  | Depreciation |  | Value
As of January 1, 2017 | $ | 916,809 |  | $ | (209,481) |  | $ | 707,328
Additions |  | 310 |  |  | — |  |  | 310
Depreciation |  | — |  |  | (33,494) |  |  | (33,494)
Impairment loss |  | (182,585) |  |  | 94,961 |  |  | (87,624)
As of December 31, 2017 | $ | 734,534 |  | $ | (148,014) |  | $ | 586,520
Additions |  | 11,675 |  |  | — |  |  | 11,675
Acquisitions through the Poseidon Transaction |  | 617,522 |  |  | — |  |  | 617,522
Depreciation |  | — |  |  | (31,117) |  |  | (31,117)
Impairment loss |  |  | (139,354) |  | 67,520 |  |  | (71,834)
As of December 31, 2018 | $ | 1,224,377 |  | $ | (111,611) |  | $ | 1,112,766

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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