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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) helicopter | Jun. 30, 2017 USD ($) helicopter | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Unfunded capital commitments | $ 114,800 | $ 114,800 |  |
Unfunded capital commitments payable | 7,200 | 7,200 |  |
Deposits paid | 1,300 | 1,300 |  |
Commitments eligible for termination | 110,600 | 110,600 |  |
Liquidated damages | 2,600 | 2,600 |  |
Other current assets | 0 | 0 |  | $ 3,777
Utilized credits |  |  | $ 1,700 |
Contingent Fees Sought by Former Tax Consultant | Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest |  | 500 |  |
Employment-Related Litigation Matters | Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest |  | 100 |  |
Unfavorable Regulatory Action | Brazilian Customs Authorities Claims | Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest |  | 900 |  |
Foreign Tax Authority | Aeroleo | Brazilian Tax Dispute with Respect to Certain Tax Credits |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest |  | 2,300 |  |
Foreign Tax Authority | Municipal Tax Authorities of Rio de Janeiro and Macae | Aeroleo |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest |  | 7,200 |  |
Foreign Tax Authority | Foreign Tax Authority | Aeroleo | Brazilian Tax Dispute with Respect to Employer Social Security Contributions |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest |  | 2,900 |  |
Foreign Tax Authority | Foreign Tax Authority | Aeroleo | Other Litigation Matters |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Other current assets | 9,300 | 9,300 |  |
Foreign Tax Authority | State of Rio de Janeiro | Aeroleo |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest | $ 400 |  |  |
Installment payments |  | (200) |  |
Damages dismissed |  | 1,600 |  |
Brazil Taxing Authorities | Tax Disputes over Tax Credits Applied to Offset Social Tax Liability | Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Taxes, penalties and interest |  | $ 300 |  |
AW189 Heavy Helicopters |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of helicopters | helicopter | 5 | 5 |  |
Number of additional helicopters | helicopter | 10 | 10 |  |
S92 Heavy Helicopters |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of helicopters | helicopter | 1 | 1 |  |
AW169 Light Twin Helicopters |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of helicopters | helicopter | 5 | 5 |  |

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