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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Commitments and contingencies |  |
Accrual for Environmental Loss Contingencies | $ 1,500,000 |
Indemnification agreements |  |
Commitments and contingencies |  |
Liabilities recorded under indemnification agreements | 0 | $ 0
Minimum |  |
Commitments and contingencies |  |
Environmental Loss Contingencies Estimate | 1,500,000 |
Maximum |  |
Commitments and contingencies |  |
Environmental Loss Contingencies Estimate | $ 3,000,000 |

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