Sales (Schedule of Sales by Major Customer) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Disclosure of major customers [line items]
Revenue	$ 257,187	$ 263,296
Customer One [member]
Disclosure of major customers [line items]
Revenue	184,304	163,425
Customer Two [member]
Disclosure of major customers [line items]
Revenue	72,938	66,429
Customer Three [member]
Disclosure of major customers [line items]
Revenue	$ (55)	$ 33,442

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details