Receivables (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Accounts Receivable [Abstract]
Accounts receivable, gross	$ 113,649	$ 141,732
Customer rebate reserve	(10,318)	(13,922)
Cash discount reserves	(4,784)	(5,326)
Allowance for doubtful accounts	(4,071)	(4,804)
Other, principally returns and allowances reserves	(622)	(1,011)
Accounts Receivable, Net	$ 93,854	$ 116,669