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ACQUISITIONS AND DISPOSITIONS - (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) helicopter | Dec. 31, 2018 USD ($) helicopter | Dec. 31, 2017 USD ($) helicopter
Property, Plant and Equipment [Line Items] |  |  |
Purchases of property and equipment | $ (6,558) | $ (9,216) | $ (16,770)
Proceeds from disposition of property and equipment | $ 13,252 | $ 29,590 | $ 9,392
Number of helicopter additions | helicopter | 0 | 1 | 1
H225 Helicopters |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from disposition of property and equipment | $ 5,000 |  |
Number of helicopter additions | helicopter | 0 | 1 | 1

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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