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STOCKHOLDERS' EQUITY AND DILUTIVE EQUITY INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 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 quarters ended March 31, 2020 and 2019 are as follows:
|  | Three months ended March 31, 2020 |  |  | Three months ended March 31, 2019 |
|  | Balance |  |  | Gains/(losses) |  |  |  |  | Remaining |  |  | Balance |  |  | Gains/(losses) |  |  |  | Remaining |
|  | at |  |  | recognized |  |  |  |  | balance |  |  | at |  |  | recognized |  |  |  | balance |
(In thousands) |  | 12/31/19 |  |  | in OCI |  |  |  |  | 3/31/20 |  |  | 12/31/18 |  |  | in OCI |  |  |  | 3/31/19 |
Pension benefits |  | $ | (236 | ) |  |  | 369 |  |  |  |  |  | 133 |  |  | $ | 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 |  | March 31, 2020 |  |  | March 31, 2019 |
Common shares outstanding |  |  | 40,259,917 |  |  |  | 37,381,954 |
New creditor warrants (strike price $0.001 per common share) |  |  | 821,308 |  |  |  | 2,070,243 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 952,154 |  |  |  | 2,047,015 |
Restricted stock units |  |  | 359,977 |  |  |  | 210,100 |
Total |  |  | 42,393,356 |  |  |  | 41,709,312 |

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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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