Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories (at LIFO value) consist of the following as of December 31 (in thousands):

	2018			2017
Finished goods	$	46,638		$	32,986
Raw materials		27,321			19,432
Total FIFO (first-in, first out) inventories		73,959			52,418
Reserve to adjust inventories to LIFO value		(18,442	)		(20,070	)
Total LIFO inventories	$	55,517		$	32,348