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ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) acquisition helicopter | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Purchases of property and equipment |  |  | $ 12,524 | $ 5,106 |
Capitalized interest payments (less than) | $ 100 | $ 0 | $ 500 | 0 |
Number of helicopter acquisitions | acquisition |  |  | 0 |  |
Number of helicopter dispositions | helicopter |  |  | 2 |  |
Proceeds from disposition of property and equipment |  |  | $ 5,689 | 5,910 |
Gains on asset dispositions, net | 5,061 | $ 1,367 | 5,170 | $ 4,280 |
Construction in Progress |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Interest capitalized in property and equipment | 1,800 |  | $ 1,800 |  | $ 4,500
AW189 Heavy Helicopters |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of helicopter acquisitions | helicopter |  |  | 2 |  |
S92 Heavy Helicopters |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Purchases of property and equipment | $ 2,800 |  |  |  |
Number of helicopter acquisitions | helicopter |  |  | 1 |  |

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