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INVESTMENT IN UNCONSOLIDATED COMPANIES (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity Method Investments And Joint Ventures [Abstract] |
Schedule of Investments in at Equity and Advances to Unconsolidated Companies | Investments in, at equity, and advances to unconsolidated joint venture companies were as follows:
|  | Percentage |  |  | December 31, |  |  | December 31, |
(In thousands) |  | Ownership |  |  | 2019 |  |  | 2018 |
Sonatide Marine, Ltd. (Angola) |  | 49% |  |  | $ | — |  |  | $ | — |
DTDW Holdings, Ltd. (Nigeria) |  | 40% |  |  |  | — |  |  |  | 1,033 |
GulfMark Marine, Ltd. (Trinidad) |  | 49% |  |  |  | — |  |  |  | 6 |
Investments in, at equity, and advances to unconsolidated companies |  |  |  |  |  | $ | — |  |  | $ | 1,039 |
Schedule of Balances with Unconsolidated Affiliates | We maintained the following balances with our unconsolidated affiliates as of December 31, 2019 and December 31, 2018:
|  | December 31, |  |  | December 31, |
(in thousands) |  | 2019 |  |  | 2018 |
Due from related parties: |  |  |  |  |  |  |  |
Sonatide (Angola) |  | $ | 89,246 |  |  |  | 109,176 |
DTDW (Nigeria) |  |  | 36,726 |  |  |  | 23,775 |
|  |  | 125,972 |  |  |  | 132,951 |
Due to related parties: |  |  |  |  |  |  |  |
Sonatide (Angola) |  | $ | 31,475 |  |  |  | 29,347 |
DTDW (Nigeria) |  |  | 18,711 |  |  |  | 5,625 |
|  |  | 50,186 |  |  |  | 34,972 |
Due from related parties, net of due to related parties |  | $ | 75,786 |  |  |  | 97,979 |
Schedule of Amounts Due from Affiliate | Amounts due from Sonatide
|  | Successor |  |  |  | Predecessor |
|  |  |  |  |  |  |  |  |  | Period from |  |  |  | Period from |
|  | Year |  |  | Year |  |  | August 1, 2017 |  |  |  | April 1, 2017 |
|  | Ended |  |  | Ended |  |  | through |  |  |  | through |
(In thousands) |  | December 31, 2019 |  |  | December 31, 2018 |  |  | December 31, 2017 |  |  |  | July 31, 2017 |
Due from Sonatide at beginning of year |  | $ | 109,176 |  |  | $ | 230,315 |  |  |  | 252,393 |  |  |  |  | 262,652 |
Revenue earned by the company through Sonatide |  |  | 52,372 |  |  |  | 56,916 |  |  |  | 40,303 |  |  |  |  | 34,397 |
Less amounts received from Sonatide |  |  | (60,486 | ) |  |  | (76,878 | ) |  |  | (28,264 | ) |  |  |  | (21,019 | )
Less amounts used to offset Due to Sonatide obligations (A) |  |  | (10,551 | ) |  |  | (78,993 | ) |  |  | (33,607 | ) |  |  |  | (21,453 | )
Less impairment of due from affiliate |  |  | — |  |  |  | (20,083 | ) |  |  | — |  |  |  |  | — |
Other |  |  | (1,265 | ) |  |  | (2,101 | ) |  |  | (510 | ) |  |  |  | (2,184 | )
|  | $ | 89,246 |  |  | $ | 109,176 |  |  |  | 230,315 |  |  |  |  | 252,393 |
| (A) | We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.
Schedule of Amounts Due to Affiliate | Amounts due to Sonatide
|  | Successor |  |  |  | Predecessor |
|  |  |  |  |  |  |  |  |  | Period from |  |  |  | Period from |
|  |  |  |  |  |  |  |  |  | August 1, 2017 |  |  |  | April 1, 2017 |
|  | Year Ended |  |  | Year Ended |  |  | through |  |  |  | through |
|  | December 31, |  |  | December 31, |  |  | December 31, |  |  |  | July 31, |
(In thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |  |  |  | 2017 |
Due to Sonatide at beginning of year |  | $ | 29,347 |  |  | $ | 99,448 |  |  |  | 123,899 |  |  |  |  | 132,857 |
Plus commissions payable to Sonatide |  |  | 4,937 |  |  |  | 5,502 |  |  |  | 3,928 |  |  |  |  | 3,330 |
Plus amounts paid by Sonatide on behalf of the company |  |  | 9,654 |  |  |  | 14,778 |  |  |  | 12,044 |  |  |  |  | 9,458 |
Less commissions paid to Sonatide |  |  | (5,961 | ) |  |  | (13,906 | ) |  |  | (5,023 | ) |  |  |  | — |
Less amounts used to offset Due from Sonatide obligations (A) |  |  | (10,551 | ) |  |  | (78,993 | ) |  |  | (33,607 | ) |  |  |  | (21,453 | )
Other |  |  | 4,049 |  |  |  | 2,518 |  |  |  | (1,793 | ) |  |  |  | (293 | )
|  | $ | 31,475 |  |  | $ | 29,347 |  |  | $ | 99,448 |  |  |  |  | 123,899 |
| (A) | We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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