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STOCKHOLDERS' EQUITY AND DILUTIVE EQUITY INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax | The changes in accumulated other comprehensive income (loss) by component, net of tax, for the three and six months ended June 30, 2020 and 2019 are as follows:
|  | Three months ended June 30, 2020 |  |  | Three months ended June 30, 2019 |
|  | Balance |  |  | Gains/(losses) |  |  |  |  | Remaining |  |  | Balance |  |  | Gains/(losses) |  |  |  | Remaining |
|  | at |  |  | recognized |  |  |  |  | balance |  |  | at |  |  | recognized |  |  |  | balance |
(In thousands) |  | 3/31/20 |  |  | in OCI |  |  |  |  | 6/30/20 |  |  | 3/31/2019 |  |  | in OCI |  |  |  | 6/30/19 |
Pension benefits |  | $ | 133 |  |  |  | 448 |  |  |  |  |  | 581 |  |  | $ | 2,194 |  |  |  | — |  |  |  |  | 2,194 |
|  | For the six months ended June 30, 2020 |  |  | For the six months ended June 30, 2019 |
|  | Balance |  |  | Gains/(losses) |  |  |  |  | Remaining |  |  | Balance |  |  | Gains/(losses) |  |  |  | Remaining |
|  | at |  |  | recognized |  |  |  |  | balance |  |  | at |  |  | recognized |  |  |  | balance |
(In thousands) |  | 12/31/19 |  |  | in OCI |  |  |  |  | 6/30/20 |  |  | 12/31/18 |  |  | in OCI |  |  |  | 6/30/19 |
Pension benefits |  |  | (236 | ) |  |  | 817 |  |  |  |  |  | 581 |  |  |  | 2,194 |  |  |  | — |  |  |  |  | 2,194 |
Summary of Common Shares and Creditor Warrants and Sum of Common Shares and Creditor Warrants Outstanding |
Total shares outstanding including warrants and restricted stock units |  | June 30, 2020 |  |  | June 30, 2019 |
Common shares outstanding |  |  | 40,335,963 |  |  |  | 37,845,158 |
New creditor warrants (strike price $0.001 per common share) |  |  | 817,742 |  |  |  | 2,034,235 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 952,154 |  |  |  | 1,683,147 |
Restricted stock units |  |  | 632,345 |  |  |  | 279,702 |
Total |  |  | 42,738,204 |  |  |  | 41,842,242 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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