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REVENUES (Details 1) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
REVENUES |  |  |  |
Unbilled trade receivables | $ 113,453 | $ 68,494 | $ 82,466 | $ 39,223

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unbilled receivables under long-term contracts that have not been billed and were not billable. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesNotBillableAtBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant