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Shareholders' Equity (Stock Options Granted in 2015, 2016 and 2017) (Narrative) (Details) - $ / shares |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 08, 2016 | Jan. 30, 2017 | Jul. 28, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercise price of options |  |  |  | $ 39.62 | $ 29.34 | $ 26.91
Share Option Plan 2013 [Member] | 39.62 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options granted |  | 119,925 |  |  |  |
Exercise price of options |  | $ 39.62 |  |  |  |
Expiration date |  | Jan. 30, 2025 |  |  |  |
Closing price to determine expiration date |  | $ 19.81 |  |  |  |
Share Option Plan 2013 [Member] | 28.38 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options granted | 93,660 |  |  |  |  |
Exercise price of options | $ 28.38 |  |  |  |  |
Expiration date | Jun. 08, 2024 |  |  |  |  |
Closing price to determine expiration date | $ 14.19 |  |  |  |  |
Share Option Plan 2013 [Member] | $26.91 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options granted |  |  | 89,907 |  |  |
Exercise price of options |  |  | $ 26.91 |  |  |
Expiration date |  |  | Jul. 28, 2023 |  |  |
Closing price to determine expiration date |  |  | $ 13.46 |  |  |
[1] | In 2016 the Company granted in the aggregate, 116,455 options. Regarding the grant of 93,660 options, see Note 11E. Regarding the grant of 22,795 options, see Note 3B.

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