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STOCKHOLDERS' EQUITY - Tangible Equity Units (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 21, 2014 USD ($) $ / shares shares | Dec. 31, 2017 shares
Class of Stock [Line Items] |  |
Minimum settlement rate | 4.4456 |
Market value greater or equal to (in dollars per share) | $ / shares | $ 11.247 |
Maximum settlement rate | 5.1124 |
Market value less than or equal to (in dollars per share) | $ / shares | $ 9.78 |
Issuance of shares of voting common stock (in shares) | shares |  | 6,134,988
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 |  |
Class of Stock [Line Items] |  |
Tangible equity units issued during period, shares | shares | 1,380,000 |
Tangible equity units issued to underwriter during period, shares | shares | 180,000 |
Proceeds from issuance of tangible equity units, net of issuance costs | $ 65,000 |
Fair value of debt instrument | 14,600 |
Adjustments to additional paid in capital, issuance of tangible equity units | 54,400 |
Tangible equity units issued, issuance costs | 4,000 |
Debt instrument, deferred finance cost | 857 |
Adjustments to additional paid in capital, tangible equity units issued, issuance costs | $ 3,200 |

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