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Goodwill (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the Carrying Amount of Goodwill by Geographic Reporting Unit
The following are the changes in the carrying amount of goodwill by geographic reporting unit:
(in thousands)
 
Americas
 
EMEA
 
Asia Pacific
 
Total
Balance at December 31, 2016
 
$

 
$
144,971

 
$
36,259

 
$
181,230

Acquisitions and adjustments
 

 
31,438

 
41

 
31,479

Effect of foreign currency exchange rates
 

 
15,539

 
2,634

 
18,173

Balance at December 31, 2017
 

 
191,948

 
38,934

 
230,882

Acquisitions and adjustments
 

 
(331
)
 

 
(331
)
Effect of foreign currency exchange rates
 

 
(7,597
)
 
(1,620
)
 
(9,217
)
Balance at December 31, 2018
 
$

 
$
184,020

 
$
37,314

 
$
221,334