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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill by reporting unit during the nine months ended September 30, 2018 were as follows:
 
Carrying Value
 
 
 
Carrying Value
 
December 31, 2017
 
Foreign Currency Translation
 
September 30, 2018
 
(In thousands)
Western Hemisphere
$
39,158

 
$
(93
)
 
$
39,065

Eastern Hemisphere
8,466

 
(411
)
 
8,055

Asia-Pacific
—

 
—

 
—

Total
$
47,624

 
$
(504
)
 
$
47,120