Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	2020		2019
Balance at beginning of year	$	535,979	$	534,780
Goodwill acquired	6,169		—
Foreign currency translation	8,122		1,199
Balance at year end	$	550,270	$	535,979

Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Table Text Block]

	2020						2019
	Gross Amount		Accumulated Amortization		Intangibles, Net		Gross Amount		Accumulated Amortization		Intangibles, Net
Customer relationships	$	201,445	$	(68,319)	$	133,126	$	197,764	$	(58,851)	$	138,913
Proven technology and patents	78,312		(52,138)		26,174		75,170		(46,532)		28,638
Tradenames (finite life)	4,896		(3,444)		1,452		4,594		(3,124)		1,470
Tradenames (indefinite life)	35,595		—		35,595		35,474		—		35,474
Other	5,215		(4,777)		438		5,462		(3,715)		1,747
	$	325,463	$	(128,678)	$	196,785	$	318,464	$	(112,222)	$	206,242