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COMMITMENTS AND CONTINGENT LIABILITIES - Non-cancelable Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 3,738
2020 3,532
2021 3,276
2022 1,810
2023 945
Thereafter 1,252
Total 14,553
Sublease income to be recognized in the future under noncancelable subleases (922)
Net operating lease minimum payments $ 13,631