Revenues (Schedule of Changes in Deferred Revenue) (Details) - USD ($) $ in Thousands |
Mar. 31, 2019 |
Dec. 31, 2018 |
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|---|---|---|---|---|
| Revenue Recognition [Abstract] | ||||
| Deferred revenue | [1] | $ 71,304 | $ 72,387 | |
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| X | ||||||||||
- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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