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SIGNIFICANT ACCOUNTING POLICIES (Cumulative Balance Sheet Adjustments - Adoption of ASC No. 606-10) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Other current assets $ 23,007 $ 26,022 $ 19,415
Accrued expenses 54,676 67,533 75,270
Accumulated deficit $ (671,355) $ (683,029) (702,959)
Impact of Adoption [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Other current assets     2,004
Accrued expenses     483
Accumulated deficit     1,521
Amounts under Topic 606-10 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Other current assets     21,419
Accrued expenses     75,753
Accumulated deficit     $ (701,438)