Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	2019		2018
Balance at beginning of year	$	534,780	$	539,838
Goodwill acquired	—		558
Foreign currency translation	1,199		(5,616		)
Balance at year end	$	535,979	$	534,780

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

	2019							2018
	Gross Amount		Accumulated Amortization			Intangibles, Net		Gross Amount		Accumulated Amortization			Intangibles, Net
Customer relationships	$	197,764	$	(58,851	)	$	138,913	$	197,942	$	(49,887	)	$	148,055
Proven technology and patents	75,170		(46,532		)	28,638		73,880		(42,750		)	31,130
Tradenames (finite life)	4,594		(3,124		)	1,470		4,504		(2,874		)	1,630
Tradenames (indefinite life)	35,474		—			35,474		35,500		—			35,500
Other	5,462		(3,715		)	1,747		3,684		(2,691		)	993
	$	318,464	$	(112,222	)	$	206,242	$	315,510	$	(98,202	)	$	217,308