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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Estimated Revenue Expected to be Recognized in Future Periods) (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Total $ 9,012
Maintenance and services [Member]  
Second half of 2018 1,668
2019 3,342
2020 2,148
2021 934
2022 505
2023 415
Total $ 9,012