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LONG-TERM DEBT - Additional Information (Details) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 15, 2016 | Apr. 06, 2015 USD ($) | Aug. 15, 2014 $ / shares | May 21, 2014 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount issued |  |  |  |  | $ 175,000,000 | $ 177,684,000 |
Net proceeds from issuance of long-term debt |  |  |  |  | $ 0 | 0 | $ 172,304,000
Debt extinguishment costs |  |  |  |  |  | 2,700,000 |
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 |  |  | $ 175,000,000 | 175,000,000 |
Stated interest rate |  | 5.25% |  |  |  |  |
Net proceeds from issuance of long-term debt |  | $ 172,800,000 |  |  |  |  |
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount issued |  |  |  |  | $ 0 | $ 2,684,000 |
Stated interest rate | 7.50% |  | 7.50% | 7.50% |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |
Gross proceeds from issuance of tangible equity units |  |  |  | $ 69,000,000 |  |  |
Tangible equity units dividend rate |  |  | 8.00% | 8.00% |  |  |
Tangible equity units issued during period, shares | shares |  |  |  | 1,380,000 |  |  |
Tangible equity units issued to underwriter during period, shares | shares |  |  |  | 180,000 |  |  |
Tangible equity units, price per share (in dollars per share) | $ / shares |  |  | $ 50 | $ 50.00 |  |  |
Tangible equity units, convertible, conversion ratio |  |  |  | 10.604556 |  |  |
Fair value of debt instrument |  |  |  | $ 14,600,000 |  |  |
Adjustments to additional paid in capital, issuance of tangible equity units |  |  |  | 54,400,000 |  |  |
Tangible equity units issued, issuance costs |  |  |  | 4,000,000 |  |  |
Tangible equity units issued, issuance costs, underwriter discount |  |  |  | 3,300,000 |  |  |
Debt instrument, deferred finance cost |  |  |  | 857,000 |  |  |
Adjustments to additional paid in capital, tangible equity units issued, issuance costs |  |  |  | $ 3,200,000 |  |  |
Equal quarterly cash installments per Amortizing Note |  |  |  | 1 |  |  |
Installment payment due on August 15, 2014 per Amortizing Note |  |  |  | 0.933333 |  |  |

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