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SETTLEMENTS, COMMITMENTS AND CONTINGENCIES - Litigation Settlements (Details) - Case Vs. Silver Slipper Casino And Hotel Contractor And Architect - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Settled Litigation | Construction Defects Receivable |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation settlement amount | $ 675 |  |  |
Legal fees |  | $ 100 | $ 100 |
Positive Outcome of Litigation | Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages sought |  |  |  | $ 1,600

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