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STOCKHOLDERS' EQUITY - Tangible Equity Units (Details) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Aug. 03, 2015 shares | May 21, 2014 USD ($) $ / shares shares | Jun. 30, 2018 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 |
Common Stock | Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Issuance of shares of voting common stock (in shares) | shares | 70,690 |  | 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 (in shares) | shares |  | 1,380,000 |
Tangible equity units issued to underwriter during period (in 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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