Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of carrying values of inventories

Inventories at the dates indicated consisted of the following: 

	At March 31,				At December 31,
(in thousands)	2018		2017		2017
Raw materials	$	87,363	$	90,545	$	91,022
In-process products	28,406		26,010		26,849
Finished products	140,783		139,716		135,125
	$	256,552	$	256,271	$	252,996