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DEBT Senior Notes (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Sep. 26, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |
Interest expense |  | $ 7,090,000 | $ 7,454,000
Senior notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, aggregate principal amount | $ 325,000,000 |  |
Notes issued, interest rate | 5.50% |  |
Proceeds from issuance of senior long-term debt | $ 318,900,000 |  |
Debt instrument, redemption price, percentage |  | 101.00% |
Debt instrument, redemption price, percentage of principal amount outstanding |  | 60.00% |
Interest expense |  | $ 4,600,000 | $ 4,600,000
Senior notes due 2025 | Debt Instrument, Redemption, Period One |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |
Debt instrument, redemption price, percentage of principal amount redeemed, threshold |  | 40.00% |
Debt instrument, redemption price, percentage for first threshold |  | 105.50% |
Senior notes due 2025 | Debt Instrument, Redemption, Period Two |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, redemption price, percentage |  | 102.75% |
Senior notes due 2025 | Debt Instrument, Redemption, Period Three |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, redemption price, percentage |  | 101.375% |
Senior notes due 2025 | Debt Instrument, Redemption, Period Four |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |

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