Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Revenues (Schedule of Changes in Deferred Revenue) (Details)

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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.