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Goodwill
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
The following table sets forth the activity in goodwill from December 31, 2018 through September 30, 2019 (in thousands):
 
Goodwill
  
Temporary and consultant staffing
 
Permanent placement staffing
 
Risk consulting and internal audit services
 
 Total
Balance as of December 31, 2018
$
134,067

 
$
26,058

 
$
49,833

 
$
209,958

Foreign currency translation adjustments
(87
)
 
(24
)
 
138

 
27

Balance as of September 30, 2019
$
133,980

 
$
26,034

 
$
49,971

 
$
209,985