Receivables (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Accounts Receivable [Abstract]
Accounts receivable, gross	$ 132,809	$ 141,732
Customer rebate reserve	(13,075)	(13,922)
Cash discount reserves	(5,290)	(5,326)
Allowance for doubtful accounts	(4,697)	(4,804)
Other, principally returns and allowances reserves	(790)	(1,011)
Accounts Receivable, Net	$ 108,957	$ 116,669