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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017 | Apr. 06, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Par Value | $ 175,000,000 | $ 175,000,000 |
Unamortized Debt Issuance Cost and Discount | $ (1,904,000) | (2,059,000) |
Senior Notes | 5.25% Senior Notes Due April 15, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.25% |  | 5.25%
Par Value | $ 175,000,000 | 175,000,000 | $ 175,000,000
Unamortized Debt Issuance Cost and Discount | $ (1,904,000) | $ (2,059,000) |

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