Business Segments (Tables)

9 Months Ended

Sep. 30, 2012

Segment Reporting Measurement Disclosures [Abstract]

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

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
Metalworking Process Chemicals
	Net sales	$	168,732	$	171,222	$	499,718	$	478,727
	Operating income for reportable segments		26,772		30,443		88,396		83,527
Coatings
	Net sales		11,222		10,378		32,695		29,347
	Operating income for reportable segments		3,016		2,452		8,328		6,861
Other Chemical Products
	Net sales		969		713		2,945		1,896
	Operating income for reportable segments		78		32		273		71
Total
	Net sales		180,923		182,313		535,358		509,970
	Operating income for reportable segments		29,866		32,927		96,997		90,459
Non-operating expenses			(13,185)		(14,800)		(45,166)		(42,318)
Amortization			(818)		(623)		(2,283)		(1,596)
Consolidated operating income			15,863		17,504		49,548		46,545
Interest expense			(1,034)		(1,166)		(3,359)		(3,584)
Interest income			149		262		409		805
Other income, net			322		2,740		529		4,070
Consolidated income before taxes and equity in net income of associated companies		$	15,300	$	19,340	$	47,127	$	47,836