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REVENUES - Contract balances (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accounts receivable |  |  |  |
Disaggregation of revenue: |  |  |  |
Unbilled trade receivables | $ 21,578 | $ 52,052 | $ 95,898 | $ 56,408

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