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STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 11, 2016 | Mar. 08, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 0 | $ 175,078 | $ 0
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of stock shares (in shares) | 5,250,000 | 4,850,000 |  |  |
Net proceeds from issuance of common stock | $ 100,000 | $ 66,500 |  |  |
Common Stock | Over Allotment Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of stock shares (in shares) |  | 727,500 |  |  |
Net proceeds from issuance of common stock |  | $ 10,500 |  |  |
Underwriters option period |  | 30 days |  |  |

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