Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	2018			2017
Balance at beginning of year	$	539,838		$	476,378
Goodwill acquired	558			52,229
Foreign currency translation	(5,616		)	11,231
Balance at year end	$	534,780		$	539,838

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

	2018							2017
	Gross Amount		Accumulated Amortization			Intangibles, Net		Gross Amount		Accumulated Amortization			Intangibles, Net
Customer relationships	$	197,942	$	(49,887	)	$	148,055	$	198,527	$	(41,794	)	$	156,733
Proven technology and patents	73,880		(42,750		)	31,130		70,311		(38,890		)	31,421
Tradenames (finite life)	4,504		(2,874		)	1,630		4,518		(2,807		)	1,711
Tradenames (indefinite life)	35,500		—			35,500		35,562		—			35,562
Other	3,684		(2,691		)	993		3,490		(2,199		)	1,291
	$	315,510	$	(98,202	)	$	217,308	$	312,408	$	(85,690	)	$	226,718