Inventory (Tables)

6 Months Ended

Jun. 30, 2012

Inventory [Abstract]

Components Of Inventory

(THOUSANDS OF DOLLARS)	JUNE 30, 2012		DECEMBER 31, 2011
Finished goods	$	25,728	$	23,538
Work in process		4,289		3,967
Raw materials		10,265		8,977
	$	40,282	$	36,482