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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
 
2016
 
2015
Balance at beginning of year
$
446,284

 
$
444,085

Goodwill acquired
41,308

 
9,773

Foreign currency translation
(11,214
)
 
(7,574
)
Balance at year end
$
476,378

 
$
446,284
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Table Text Block]
 
2016
 
2015
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
Customer relationships
$
147,466

 
$
(34,672
)
 
$
112,794

 
$
98,175

 
$
(30,836
)
 
$
67,339

Proven technology and patents
58,394

 
(35,128
)
 
23,266

 
52,938

 
(32,444
)
 
20,494

Tradenames (finite life)
4,182

 
(2,514
)
 
1,668

 
4,200

 
(2,158
)
 
2,042

Tradenames (indefinite life)
28,272

 
—

 
28,272

 
24,814

 
—

 
24,814

Other
2,871

 
(1,816
)
 
1,055

 
2,111

 
(1,548
)
 
563

 
$
241,185

 
$
(74,130
)
 
$
167,055

 
$
182,238

 
$
(66,986
)
 
$
115,252