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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, 2015 USD ($) shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Class of Stock [Line Items] |  |  |  |
Proceeds from issuance of tangible equity units, net of issuance costs | $ |  | $ 0 | $ 64,959 | $ 0
Minimum settlement rate | 4.4456 |  |  |
Market value greater or equal to | $ / shares | $ 11.247 |  |  |
Maximum settlement rate | 5.1124 |  |  |
Market value less than or equal to | $ / shares | $ 9.78 |  |  |
Tangible equity units settled |  | 1,244,743 |  |
Issuance of shares of voting common stock |  | 5,533,629 |  |
Tangible equity units outstanding |  | 135,257 |  |
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Tangible equity units issued during period, shares | 1,380,000 |  |  |
Tangible equity units issued to underwriter during period, 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 | $ / shares | $ 50.00 |  |  |
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 | Notes Payable |  |  |  |
Class of Stock [Line Items] |  |  |  |
Long-term debt | $ |  | $ 7,500 | $ 12,000 |

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