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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loss on Debt Extinguishment (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018 | May 31, 2018 | Nov. 10, 2016 | Nov. 04, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Loss on debt extinguishment | $ 4,533 |  |  |  |  |
$400 Million Credit Facility | Secured Debt |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Face amount of term loan facility | 400,000 | $ 400,000 | $ 400,000 |  | $ 400,000 |
$98 Million Credit Facility | Line of Credit Facility |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Face amount of term loan facility | 98,000 | $ 98,000 | $ 98,000 |  |  | $ 98,000
$460 Million Credit Facility | Secured Debt |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Face amount of term loan facility | $ 460,000 |  |  | $ 460,000 |  |

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