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Deferred Revenues (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Revenue from External Customer [Line Items] |  |
Short-term deferred revenues | $ 85,776 | $ 78,774
Long-term deferred revenues | 8,957 | 10,623
Services contracts |  |
Revenue from External Customer [Line Items] |  |
Short-term deferred revenues | $ 14,600 | $ 16,900

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