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ACQUISITIONS AND DISPOSITIONS - Dispositions (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 23, 2018 USD ($) | Dec. 31, 2019 helicopter | Dec. 31, 2018 USD ($) helicopter | Dec. 31, 2017 helicopter
Property, Plant and Equipment [Line Items] |  |  |  |
2019 | $ |  |  | $ 1,573 |
Number of helicopter dispositions |  | 5 | 21 | 3
Property, plant and equipment, disposals | $ | $ 10,000 |  |  |
Light Helicopters - Single Engine |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of helicopter dispositions |  | 0 | 10 | 1
Light Helicopters - Twin Engine |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of helicopter dispositions |  | 3 | 2 | 1
Medium Helicopter |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of helicopter dispositions |  | 2 | 1 | 1
Heavy Helicopter |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of helicopter dispositions |  | 0 | 8 | 0

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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