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Revenues (Schedule of Changes in Deferred Revenue) (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
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