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LEASES - Narrative (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) helicopter | Dec. 31, 2018 USD ($) helicopter | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Rental expense | $ 4,000 |  |
Short-term Lease | $ 1,500 |  |
Number of helicopter dispositions | helicopter | 2 | 6 |
Sales-type lease, interest income | $ 1,700 |  |
Proceeds from disposition of property and equipment | 13,252 | $ 29,590 | $ 9,392
Sales-type lease receivable | $ 13,500 |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining lease term | 1 year |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining lease term | 59 years |  |
H225 Helicopters |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from disposition of property and equipment | $ 5,000 |  |

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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