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Shareholders' Equity (Stock Options Granted in 2017 and 202020) (Narrative) (Details) - $ / shares |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 08, 2020 | Jun. 08, 2016 | Jan. 31, 2019 | Apr. 30, 2018 | Jan. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Exercise price of options |  |  |  |  |  | $ 32.54 | $ 33.83 | $ 36.11
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] | 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] | 36.11 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted |  |  |  | 137,010 |  |  |  |
Exercise price of options |  |  |  | $ 36.11 |  |  |  |
Expiration date |  |  |  | Apr. 30, 2026 |  |  |  |
Closing price to determine expiration date |  |  |  | $ 18.06 |  |  |  |
Share Option Plan 2013 [Member] | 33.83 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted |  |  | 141,928 |  |  |  |  |
Exercise price of options |  |  | $ 33.83 |  |  |  |  |
Expiration date |  |  | Jan. 31, 2027 |  |  |  |  |
Closing price to determine expiration date |  |  | $ 16.92 |  |  |  |  |
Share Option Plan 2013 [Member] | $32.54 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted | 148,426 |  |  |  |  |  |  |
Exercise price of options | $ 32.54 |  |  |  |  |  |  |
Expiration date | Jun. 08, 2028 |  |  |  |  |  |  |
Closing price to determine expiration date | $ 16.27 |  |  |  |  |  |  |

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