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Revenues (Schedule of Changes in Deferred Revenue) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Revenue Recognition [Abstract] |  |  |
Deferred revenue | [1] | $ 68,307 | $ 72,387
[1] | Includes $16.0 million and $18.4 million under long term deferred revenue in the Company's consolidated balance sheets as of December 31, 2019 and December 31, 2018, respectively.

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration