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Revenue Sources and Concentration of Sales (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenues	$ 316,519	$ 409,474
Sales Revenue, Net [Member] | Customers Outside of US [Member]
Revenues	$ 12,943	$ 23,212
Sales Revenue, Net [Member] | Largest Customer [Member]
Concentration Risk, Percentage	26.00%	21.00%
Sales Revenue, Net [Member] | Second Largest Customer [Member]
Concentration Risk, Percentage	19.00%	15.00%
Sales Revenue, Net [Member] | Third Largest Customer [Member]
Concentration Risk, Percentage	10.00%	12.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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