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FAIR VALUE MEASUREMENTS - Financial Liabilities at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Liabilities: |  |
Total liabilities measured at fair value on a recurring basis | $ 6,838 | $ 5,900
Restricted Stock |  |
Financial Liabilities: |  |
Performance-based equity awards | 6,754 | 3,789
Cash-Settled Award | Restricted Stock Units |  |
Financial Liabilities: |  |
Cash-settled restricted stock units | 84 | 2,111
Level 1 |  |
Financial Liabilities: |  |
Total liabilities measured at fair value on a recurring basis | 6,838 | 5,900
Level 1 | Restricted Stock |  |
Financial Liabilities: |  |
Performance-based equity awards | 6,754 | 3,789
Level 1 | Cash-Settled Award | Restricted Stock Units |  |
Financial Liabilities: |  |
Cash-settled restricted stock units | 84 | 2,111
Level 2 |  |
Financial Liabilities: |  |
Total liabilities measured at fair value on a recurring basis | 0 | 0
Level 2 | Restricted Stock |  |
Financial Liabilities: |  |
Performance-based equity awards | 0 | 0
Level 2 | Cash-Settled Award | Restricted Stock Units |  |
Financial Liabilities: |  |
Cash-settled restricted stock units | 0 | 0
Level 3 |  |
Financial Liabilities: |  |
Total liabilities measured at fair value on a recurring basis | 0 | 0
Level 3 | Restricted Stock |  |
Financial Liabilities: |  |
Performance-based equity awards | 0 | 0
Level 3 | Cash-Settled Award | Restricted Stock Units |  |
Financial Liabilities: |  |
Cash-settled restricted stock units | $ 0 | $ 0

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