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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
 
2015
 
2014
Balance at beginning of year
$
444,085

 
$
455,842

Goodwill acquired
9,773

 
1,282

Foreign currency translation
(7,574
)
 
(13,039
)
Balance at year end
$
446,284

 
$
444,085
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Table Text Block]
 
2015
 
2014
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
Customer relationships
$
98,175

 
$
(30,836
)
 
$
67,339

 
$
98,325

 
$
(28,159
)
 
$
70,166

Proven technology and patents
52,938

 
(32,444
)
 
20,494

 
45,588

 
(30,761
)
 
14,827

Tradenames (finite life)
4,200

 
(2,158
)
 
2,042

 
4,140

 
(1,786
)
 
2,354

Tradenames (indefinite life)
24,814

 
—

 
24,814

 
24,947

 
—

 
24,947

Other
2,111

 
(1,548
)
 
563

 
1,573

 
(1,083
)
 
490

 
$
182,238

 
$
(66,986
)
 
$
115,252

 
$
174,573

 
$
(61,789
)
 
$
112,784