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Sales (Schedule of Sales by Major Customer) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of major customers [line items]    
Revenue $ 268,111 $ 210,255
Customer One [member]    
Disclosure of major customers [line items]    
Revenue 106,850 71,184
Customer Two [member]    
Disclosure of major customers [line items]    
Revenue 73,146 71,967
Customer Three [member]    
Disclosure of major customers [line items]    
Revenue 79,523 18,238
Customer Four [member]    
Disclosure of major customers [line items]    
Revenue 8,508 40,646
Other Customers [member]    
Disclosure of major customers [line items]    
Revenue $ 84 $ 8,220