Inventories, Net (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Components of Inventories

The components of inventories, net of allowances, are as follows (in thousands):

	December 31,
	2017		2016
Finished goods	$	79,226	73,027
Work in process	15,447		14,719
Raw materials and supplies	88,895		87,047
	$	183,568	$	174,793

Summary Of Allowance For Excess And Obsolete Inventory

The activity in the allowance for excess, obsolete, and net realizable value inventory account for the two years ended December 31, 2017 and 2016, was as follows (in thousands):

	Years Ended December 31,
	2017			2016
Balance at beginning of year	$	33,532		$	21,537
Provision	21,369			32,072
Charges processed	(20,499		)	(20,077		)
Balance at end of year	$	34,402		$	33,532