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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Intangible assets    
Gross Carrying Amount $ 100,645 $ 100,645
Accumulated Amortization (83,718) (79,707)
Currency impact (322) (316)
Net Book Value 16,605 20,622
Amortization expense 4,011 5,032
Estimated future amortization expense    
2020 3,418  
2021 2,062  
2022 1,673  
2023 1,421  
2024 1,193  
Thereafter 6,838  
Estimated future amortization expense 16,605  
Customer relationships    
Intangible assets    
Gross Carrying Amount 73,723 73,723
Accumulated Amortization (63,761) (60,256)
Currency impact (116) (112)
Net Book Value 9,846 13,355
Noncompete agreements    
Intangible assets    
Gross Carrying Amount 5,952 5,952
Accumulated Amortization (5,862) (5,812)
Currency impact 1 1
Net Book Value 91 141
Software    
Intangible assets    
Gross Carrying Amount 1,500 1,500
Accumulated Amortization (1,500) (1,500)
Backlog    
Intangible assets    
Gross Carrying Amount 5,002 5,002
Accumulated Amortization (4,981) (4,981)
Currency impact (21) (21)
Databases    
Intangible assets    
Gross Carrying Amount 13,218 13,218
Accumulated Amortization (6,364) (5,908)
Currency impact (186) (184)
Net Book Value $ 6,668 $ 7,126
Trademarks and trade names    
Intangible assets    
Estimated Useful Lives 5 years 5 years
Gross Carrying Amount $ 1,250 $ 1,250
Accumulated Amortization $ (1,250) $ (1,250)
Minimum | Customer relationships    
Intangible assets    
Estimated Useful Lives 2 years 2 years
Minimum | Noncompete agreements    
Intangible assets    
Estimated Useful Lives 4 years 4 years
Minimum | Software    
Intangible assets    
Estimated Useful Lives 3 years 3 years
Minimum | Backlog    
Intangible assets    
Estimated Useful Lives 1 year 1 year
Minimum | Databases    
Intangible assets    
Estimated Useful Lives 4 years 4 years
Maximum | Customer relationships    
Intangible assets    
Estimated Useful Lives 15 years 15 years
Maximum | Noncompete agreements    
Intangible assets    
Estimated Useful Lives 7 years 7 years
Maximum | Software    
Intangible assets    
Estimated Useful Lives 4 years 4 years
Maximum | Backlog    
Intangible assets    
Estimated Useful Lives 2 years 2 years
Maximum | Databases    
Intangible assets    
Estimated Useful Lives 15 years 15 years