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Goodwill
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill
The following table sets forth the activity in goodwill from December 31, 2016, through December 31, 2018 (in thousands):
 
 
Goodwill
  
Temporary and consultant staffing
 
Permanent placement staffing
 
Risk consulting and internal audit services
 
 Total
Balance as of December 31, 2016
$
133,875

 
$
26,015

 
$
49,903

 
$
209,793

Foreign currency translation adjustments
613

 
144

 
335

 
1,092

Balance as of December 31, 2017
$
134,488

 
$
26,159

 
$
50,238

 
$
210,885

Foreign currency translation adjustments
(421
)
 
(101
)
 
(405
)
 
(927
)
Balance as of December 31, 2018
$
134,067

 
$
26,058

 
$
49,833

 
$
209,958