Business Segments (Tables)

6 Months Ended

Jun. 30, 2018

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,
		2018		2017		2018		2017
Net sales
	North America	$	97,392	$	90,331	$	189,212	$	177,672
	EMEA		60,166		54,507		122,221		108,434
	Asia/Pacific		55,348		47,724		104,125		92,874
	South America		9,056		8,621		18,459		17,112
Total net sales		$	221,962	$	201,183	$	434,017	$	396,092
Operating earnings, excluding indirect operating expenses
	North America	$	23,237	$	19,621	$	43,602	$	40,258
	EMEA		9,096		8,217		19,389		17,463
	Asia/Pacific		14,621		11,812		26,763		22,055
	South America		1,114		1,064		1,749		1,861
Total operating earnings, excluding indirect operating expenses			48,068		40,714		91,503		81,637
Combination-related expenses			(4,291)		(4,338)		(9,500)		(13,413)
Indirect operating expenses			(19,369)		(16,642)		(35,511)		(32,959)
Amortization expense			(1,845)		(1,831)		(3,698)		(3,604)
Consolidated operating income			22,563		17,903		42,794		31,661
Other income (expense), net			261		(1,571)		(108)		(1,676)
Interest expense			(1,602)		(780)		(3,294)		(1,436)
Interest income			571		540		1,060		1,063
Consolidated income before taxes and equity in net income of
	associated companies	$	21,793	$	16,092	$	40,452	$	29,612