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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Interest costs capitalized |  | $ 0.1 | $ 0.5
Construction in Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated capitalized interest costs | $ 0.7 | $ 0.7 |
Helicopters (estimated salvage value at 40% of cost) |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 15 years |  |
Salvage value percentage | 40.00% |  |
Machinery, equipment and spares | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 5 years |  |
Buildings and leasehold improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 10 years |  |
Buildings and leasehold improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 30 years |  |
Furniture, Fixtures, Vehicles and Other | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 3 years |  |
Furniture, Fixtures, Vehicles and Other | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 5 years |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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