Business Segments (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting Measurement Disclosures [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2012		2011		2012		2011
Metalworking Process Chemicals
	Net sales	$	165,011	$	156,772	$	330,986	$	307,505
	Operating income for reportable segments		30,649		26,149		61,624		53,084
Coatings
	Net sales		10,950		10,487		21,473		18,969
	Operating income for reportable segments		2,799		2,446		5,312		4,409
Other Chemical Products
	Net sales		836		533		1,976		1,183
	Operating income for reportable segments		53		4		195		39
Total
	Net sales		176,797		167,792		354,435		327,657
	Operating income for reportable segments		33,501		28,599		67,131		57,532
Non-operating expenses			(15,799)		(13,171)		(31,981)		(27,518)
Amortization			(719)		(487)		(1,465)		(973)
Consolidated operating income			16,983		14,941		33,685		29,041
Interest expense			(1,151)		(1,200)		(2,325)		(2,418)
Interest income			137		271		260		543
Other (expense) income, net			(134)		791		207		1,330
Consolidated income before taxes and equity in net income of associated companies		$	15,835	$	14,803	$	31,827	$	28,496