Revenue Recognition (Schedule of Changes in deferred revenue) (Details) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
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| Revenue Recognition [Abstract] | ||||
| Deferred revenue | [1] | $ 69,161 | $ 68,108 | |
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| X | ||||||||||
- 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. No definition available.
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| X | ||||||||||
- References No definition available.
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