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LONG-TERM DEBT - Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 07, 2018 | Dec. 20, 2015 | Dec. 01, 2015 | Dec. 07, 2012 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 06, 2018 | Dec. 31, 2015 | Dec. 23, 2010 | Nov. 24, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  | $ 162,405,000 | $ 165,203,000 |  |  |  |  |
Gains (losses) on debt extinguishment |  |  |  |  | $ (13,000) | 175,000 | $ 0 |  |  |  |
Write off of debt issuance cost |  |  |  |  |  | $ 400,000 |  |  |  |  |
7.750% Senior Notes (excluding unamortized discount) | Senior Unsecured Notes Due December 15, 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 200,000,000.0 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 7.75% | 7.75% | 7.75% |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 191,900,000 |  |  |  |  |  |  |
Outstanding borrowings |  |  |  | 200,000,000.0 |  |  |  |  |  |  |
face amount |  |  |  |  | $ 700,000 |  |  |  |  |  |
Repayments of senior notes |  |  |  |  | 700,000 |  |  |  |  |  |
Interest paid |  |  |  |  | 100,000 |  |  |  |  |  |
Gains (losses) on debt extinguishment |  |  |  |  | 100,000 |  |  |  |  |  |
Promissory notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  | $ 18,317,000 | $ 19,980,000 |  |  |  |  |
Promissory notes | Promissory Note to Purchase Heavy Helicopter |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  | $ 27,000,000.0 |
Outstanding borrowings |  | $ 19,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate at year-end |  |  |  |  | 3.50% |  |  |  |  |  |
Note required monthly payments |  | 100,000 |  |  |  |  |  |  |  |  |
Note required final payment |  | $ 12,800,000 |  |  |  |  |  |  |  |  |
Promissory notes | Promissory Note to Purchase Medium Helicopter |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 11,700,000.0
Outstanding borrowings |  |  | $ 5,900,000 |  |  |  |  |  |  |  |
Debt instrument, interest rate at year-end |  |  |  |  | 3.50% |  |  |  |  |  |
Note required monthly payments |  |  | 100,000.0 |  |  |  |  |  |  |  |
Note required final payment |  |  | $ 4,000,000 |  |  |  |  |  |  |  |
Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 125,000,000 |  |  |  | $ 125,000,000 |  |  | $ 200,000,000 | $ 125,000,000 |  |
Interest coverage ratio | 175.00% |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio | 325.00% |  |  |  |  |  |  |  |  |  |
Basis spread increase | 0.50% |  |  |  |  |  |  |  |  |  |
Maximum commitment increase amount |  |  |  |  |  |  |  |  | 50,000,000 |  |
Commitment fee, unused portion |  |  |  |  | 0.50% |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  | $ 124,300,000 |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 700,000 |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 1,300,000 |  |  |  |  |
Senior secured revolving credit facility | Promissory notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings outstanding |  |  |  | $ 190,000,000 |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |
Base Rate | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  |  |  |  | 1.75% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Promissory notes | Promissory Note to Purchase Heavy Helicopter |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  | 1.81% |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Promissory notes | Promissory Note to Purchase Medium Helicopter |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  |  | 1.81% |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  |  |  |  | 2.75% |  |  |  |  |  |
Minimum | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee, unused portion |  |  |  |  | 0.375% |  |  |  |  |  |
Minimum | Base Rate | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  |  |  |  | 1.25% |  |  |  |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  |  |  |  | 2.25% |  |  |  |  |  |
Maximum | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee, unused portion |  |  |  |  | 0.50% |  |  |  |  |  |
Maximum | Base Rate | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  |  |  |  | 2.50% |  |  |  |  |  |
Maximum | London Interbank Offered Rate (LIBOR) | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread |  |  |  |  | 3.50% |  |  |  |  |  |

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