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Revenue Sources and Concentration of Sales (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 358,093	$ 364,754
Accounts Receivable, after Allowance for Credit Loss, Current	6,408	9,571
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customers Outside of US [Member]
Revenues	$ 0	$ 0
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Largest Customer [Member]
Concentration Risk, Percentage	19.00%	20.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Second Largest Customer [Member]
Concentration Risk, Percentage	16.00%	19.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Third Largest Customer [Member]
Concentration Risk, Percentage	15.00%	16.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Accounts Receivable, after Allowance for Credit Loss, Current		$ 9,571
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Largest Customer [Member]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 6,408
Concentration Risk, Percentage	28.00%	35.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Second Largest Customer [Member]
Concentration Risk, Percentage	19.00%	29.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Third Largest Customer [Member]
Concentration Risk, Percentage	17.00%

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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