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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease liabilities | $ 115,887 | $ 115,887 |  | $ 0
Operating lease right-of-use assets | 116,560 | 116,560 |  | $ 0
Short-term lease expense | $ 196 | $ 961 |  |
ASU 2016-02, Leases (Topic 842) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease liabilities |  |  | $ 144,000 |
Operating lease right-of-use assets |  |  | $ 144,000 |

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