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LONG-TERM DEBT - Narrative (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 25, 2018 USD ($) | Aug. 29, 2017 USD ($) credit_agreement | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Number of credit agreements | credit_agreement |  | 2 |  |  |
Write off of debt issuance costs |  |  | $ 60,000 | $ 578,000 | $ 0
Interest expense |  |  | 20,937,000 | 17,054,000 | $ 15,564,000
Unamortized debt issuance costs |  |  | 8,300,000 | 10,100,000 |
ABL Revolver |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity under credit agreement |  | $ 85,000,000.0 |  |  |
Maturity date |  | Aug. 29, 2022 |  |  |
Amount outstanding under line of credit |  |  | 0 |  |
Borrowing capacity, including impact of letters of credit |  |  | 79,300,000 |  |
ABL Revolver | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Incremental increase in term loan |  | $ 10,000,000 |  |  |
ABL Revolver | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Incremental increase in term loan |  | $ 50,000,000 |  |  |
ABL Revolver | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |
ABL Revolver | LIBOR | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.75% |  |  |
Term Loan B |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Deb instrument face amount |  | $ 250,000,000.0 |  |  |
Maturity date |  | Aug. 29, 2023 |  |  |
Prepayment penalty on soft call | 1.00% |  |  |  |
Prepayment period penalty on soft call | 6 months |  |  |  |
Write off of debt issuance costs | $ 60,000 |  | $ 100,000 | $ 600,000 |
Interest expense | $ 900,000 |  |  |  |
Term Loan B | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 4.75% | 5.50% |  |  |
Term Loan B | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.00% | 1.00% |  |  |
Term Loan B | Base Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 3.75% |  |  |
Term Loan B | Base Rate | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 4.50% |  |  |

X
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