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Sales (Schedule of Sales by Major Customer) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of major customers [line items] |  |
Revenue | $ 278,966 | $ 257,187
Customer One [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 191,026 | 184,304
Customer Two [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 67,643 | 72,938
Customer Three [member] |  |
Disclosure of major customers [line items] |  |
Revenue (expenses) |  | $ (55)
Customer Four [member] |  |
Disclosure of major customers [line items] |  |
Revenue | $ 20,297 |

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