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GOVERNMENT CONTRACTS (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
contract
segment
Sep. 30, 2020
USD ($)
contract
segment
Contracts [Line Items]    
Number of contracts that can be terminated (in contracts) 15 15
Performance bond commitments | $ $ 25.2 $ 25.2
Expiring contracts    
Contracts [Line Items]    
Number of services with expiration dates within 12-month period (in contracts) 11 11
Contract expiration period   12 months
Number of contracts that can be terminated with renewal provisions (in contracts) | segment 6 6
Consolidated revenues | Contracts that can be terminated without cause | Government contracts concentration risk    
Contracts [Line Items]    
Concentration risk percentage 45.00% 52.00%
Consolidated revenues | Expiring contracts | Government contracts concentration risk    
Contracts [Line Items]    
Concentration risk percentage 28.00% 33.00%