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LONG-TERM DEBT - Additional Information (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 06, 2015 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Aggregate principal amount issued |  | $ 175,000,000 | $ 175,000,000
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, optional redemption period prior to maturity |  | 90 days |
Minimum redemption period notice required |  | 30 days |
Maximum redemption period notice required |  | 60 days |
Redemption price, percentage |  | 100.00% |
Senior Notes | 5.25% Senior Notes Due April 15, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount issued | $ 175,000,000.0 | $ 175,000,000 | $ 175,000,000
Stated interest rate (percent) | 5.25% | 5.25% |
Net proceeds from issuance of long-term debt | $ 172,800,000 |  |

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