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GOODWILL, TRADE NAMES, AND OTHER INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]            
Impairment charges $ 15,011 $ 14,502 $ 15,011 $ 14,502    
Weighted average amortization period if not accelerated           7 years 6 months
Impact of accelerated amortization on earnings per share (in dollars per share) $ 0.04   $ 0.06      
Accelerated Amortization            
Goodwill [Line Items]            
Amortization of intangible assets $ 1,400   $ 2,100      
Accelerated Amortization | Forecast            
Goodwill [Line Items]            
Amortization of intangible assets         $ 2,900  
Search | Goodwill            
Goodwill [Line Items]            
Impairment charges 10,200          
Search | Customer relationships            
Goodwill [Line Items]            
Impairment charges $ 300          
Nurse And Allied Staffing | Trade names            
Goodwill [Line Items]            
Impairment of intangible assets   $ 14,500