| RESTRUCTURING AND LIABILITY MANAGEMENT (Summary of Cost Incurred) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 
|---|---|---|
| Sep. 30, 2020  USD ($) | Sep. 30, 2020  USD ($) | |
| Restructuring and Related Activities [Abstract] | ||
| Workforce reduction | 10.00% | 10.00% | 
| Reduction in workforce | $ 1,460 | $ 1,460 | 
| Liability management | 7,524 | 8,141 | 
| Total restructuring and liability management | $ 8,984 | $ 9,601 | 
| X | ||||||||||
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- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- References No definition available. 
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- Definition Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s). No definition available. 
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| X | ||||||||||
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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