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Selling General and Administrative (Schedule of Selling General And Administrative Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Selling, General and Administrative [abstract]
General and administrative expense	$ 19,320	$ 15,616
Workers' participation	1,750	1,363
Selling, genereal and administrative subtotal	21,070	16,979
Share-based payments	3,841	14,138
Total selling, general and administrative expense	$ 24,911	$ 31,117

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- Definition

Selling, General and Administrative [abstract].

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Selling, general and administrative expense excluding sharebased payments.

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Workers particpation expense.

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- Definition

The amount of expense from share-based payment transactions with employees.

+ References

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- Definition

The amount of expense relating to general and administrative activities of the entity.

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The amount of expense relating to selling, general and administrative activities of the entity.

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