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Goodwill (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Goodwill [Abstract]  
Summary of Goodwill

Balance, December 31, 2015

 

$

208,479

 

Exchange adjustment

 

 

(1,080

)

Balance, December 31, 2016

 

 

207,399

 

Exchange adjustment

 

 

(2,232

)

Balance, December 31, 2017

 

$

205,167