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Restricted Cash, Deposits and Marketable Securities (Narrative) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Disclosure of financial assets [line items] |  |
Short-term deposits interest rate |  | 0.27%
WACHOVIA [Member] |  |
Disclosure of financial assets [line items] |  |
Bonds coupon rate | 4.435% |
Bonds Maturity date | Dec. 30, 2020 |
Bonds rating | Baa3 |
Annual interest rate | 5.80% |

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