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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
 
2017
 
2016
Balance at beginning of year
$
476,378

 
$
446,284

Goodwill acquired
52,229

 
41,308

Foreign currency translation
11,231

 
(11,214
)
Balance at year end
$
539,838

 
$
476,378
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Table Text Block]
 
2017
 
2016
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
Customer relationships
$
198,527

 
$
(41,794
)
 
$
156,733

 
$
147,466

 
$
(34,672
)
 
$
112,794

Proven technology and patents
70,311

 
(38,890
)
 
31,421

 
58,394

 
(35,128
)
 
23,266

Tradenames (finite life)
4,518

 
(2,807
)
 
1,711

 
4,182

 
(2,514
)
 
1,668

Tradenames (indefinite life)
35,562

 
—

 
35,562

 
28,272

 
—

 
28,272

Other
3,490

 
(2,199
)
 
1,291

 
2,871

 
(1,816
)
 
1,055

 
$
312,408

 
$
(85,690
)
 
$
226,718

 
$
241,185

 
$
(74,130
)
 
$
167,055