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LONG-TERM DEBT - Summary of Long-term Debt (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 15, 2016 | Apr. 06, 2015 | Aug. 15, 2014 | May 21, 2014
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Par Value | $ 175,000,000 | $ 177,684,000 |  |  |  |
Discount | (2,059,000) | (2,306,000) |  |  |  |
Senior Notes | 5.25% Senior Notes Due April 15, 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  | 5.25% |  |
Par Value | 175,000,000 | 175,000,000 |  | $ 175,000,000 |  |
Discount | (2,059,000) | (2,281,000) |  |  |  |
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 7.50% |  | 7.50% | 7.50%
Par Value | 0 | 2,684,000 |  |  |  |
Discount | $ 0 | $ (25,000) |  |  |  |

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