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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock (Details) - 2015 EIP Plan - Restricted Stock - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Stock Awards |  |
Vesting period of awards | 3 years |
Number of Shares |  |
Vested (in shares) | 0 | 0
Unrecognized compensation cost related to nonvested stock awards |  |
Unrecognized compensation cost | $ 0 |
General and Administrative Expense |  |
Additional disclosures |  |
Recognized nonvested stock amortization expense |  | $ 3

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