Receivables (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Accounts Receivable [Abstract]
Accounts receivable, gross	$ 131,089	$ 141,732
Customer rebate reserve	(10,452)	(13,922)
Allowance for doubtful accounts	(4,435)	(4,804)
Cash discount reserves	(5,132)	(5,326)
Other, principally returns and allowances reserves	(1,002)	(1,011)
Accounts Receivable, Net	$ 110,068	$ 116,669