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Revenues (Schedule of Changes in Deferred Revenue) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Revenue Recognition [Abstract] |  |  |
Deferred revenue | [1] | $ 72,387 | $ 68,108
[1] | Includes $18.4 million and $15.2 million under long term deferred revenue in the Company's consolidated balance sheets as of December 31, 2018 and December 31, 2017, respectively.

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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration