Business Segments (Tables)

6 Months Ended

Jun. 30, 2016

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,
		2016		2015		2016		2015
Net sales
	North America	$	83,088	$	85,965	$	165,460	$	168,967
	EMEA		53,108		41,171		100,757		84,356
	Asia/Pacific		43,151		47,846		84,663		92,846
	South America		7,568		8,744		14,112		18,887
Total net sales		$	186,915	$	183,726	$	364,992	$	365,056
Operating earnings, excluding indirect operating expenses
	North America	$	20,122	$	20,220	$	38,754	$	38,045
	EMEA		8,903		6,861		16,956		13,432
	Asia/Pacific		11,080		12,190		22,128		22,624
	South America		338		757		23		2,009
Total operating earnings, excluding indirect operating expenses			40,443		40,028		77,861		76,110
Indirect operating expenses			(16,538)		(16,963)		(32,945)		(33,554)
Amortization expense			(1,812)		(1,620)		(3,589)		(3,247)
Consolidated operating income			22,093		21,445		41,327		39,309
Other income (expense), net			271		(88)		977		(282)
Interest expense			(727)		(607)		(1,468)		(1,194)
Interest income			545		375		893		695
Consolidated income before taxes and equity in net income of
	associated companies	$	22,182	$	21,125	$	41,729	$	38,528