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STOCKHOLDERS' EQUITY - Tangible Equity Units (Details) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 03, 2015 shares | May 21, 2014 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) shares | Dec. 31, 2016 USD ($)
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 |  |
Tangible equity units outstanding |  |  | 0 |
Long term debt, net | $ |  |  | $ 172,865 | $ 175,378
Common Stock | Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of shares of voting common stock (in 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) |  | 1,380,000 |  |
Tangible equity units issued to underwriter during period (in shares) |  | 180,000 |  |
Proceeds from issuance of tangible equity units, net of issuance costs | $ |  | $ 65,000 |  |
Tangible equity units, convertible, conversion ratio |  | 10.604556 |  |
Stated interest rate |  | 7.50% |  |
Equal quarterly cash installments per Amortizing Note |  | 1.00 |  |
Installment payment due on August 15, 2014 per Amortizing Note |  | 0.933333 |  |
Tangible equity units dividend rate |  | 8.00% |  |
Tangible equity units, price per share (in dollars per share) | $ / shares |  | $ 50.00 |  |
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 | Long Term Debt |  |  |  |
Class of Stock [Line Items] |  |  |  |
Long term debt, net | $ |  |  | $ 0 | $ 2,700

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