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GOODWILL
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL
GOODWILL
Goodwill by reportable segment was as follows:
 
North America
 
Europe
 
Total
Balance as of December 31, 2017
$
77,290

 
$
42,241

 
$
119,531

Continuum acquisition (Note 2)
26,293

 
—

 
26,293

Effect of net foreign currency exchange rate changes
(285
)
 
(872
)
 
(1,157
)
Balance as of June 30, 2018
$
103,298

 
$
41,369

 
$
144,667


There were no accumulated impairment losses in the North America or Europe reportable segments as of June 30, 2018 or December 31, 2017.