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Sales (Schedule of Sales by Major Customer) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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