Goodwill (Schedule of Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Goodwill [Abstract]. | ||
| Goodwill as of January 1 | $ 385,629 | $ 383,853 |
| Translation differences | 1,500 | 1,700 |
| Goodwill as of December 31 | $ 387,108 | $ 385,629 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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