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Long-Term Debt, Net - Kelty Loan Agreement (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2010
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Proceeds from sale of a subsidiary |  |  | $ 0 | $ 374,000 | $ 5,348,000 |
Interest paid |  |  | (3,309,000) | (1,730,000) | (2,363,000) |
Gain from sale of subsidiary |  |  | 0 | 2,257,000 | $ 0 |
Borrowings |  |  | $ 41,538,000 | $ 65,572,000 |  |
Kelty Marine Limited |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Management daily fee |  | $ 900,000 |  |  |  |
Commerzbank |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, Face amount |  |  |  |  |  | $ 26,650,000
Accrued interest | $ 122,000 |  |  |  |  |
Proceeds from sale of a subsidiary | 6,860,000 |  |  |  |  |
Interest paid | 40,700 |  |  |  |  |
Borrowings | $ 15,650,000 |  |  |  |  |

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