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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Intangible assets |  |  |
Gross Carrying Amount | $ 106,915 | $ 102,615 |
Acquisitions | 1,400 | 4,300 |
Accumulated Amortization | (95,380) | (92,216) |
Currency Impact | (320) | (319) |
Net Book Value | 12,615 | 14,380 |
Amortization expense | 3,164 | 2,323 | $ 2,643
Estimated future amortization expense |  |  |
2024 | 2,927 |  |
2025 | 2,391 |  |
2026 | 1,774 |  |
2027 | 1,444 |  |
2028 | 1,253 |  |
Thereafter | 2,826 |  |
Estimated future amortization expense | 12,615 |  |
Customer relationships |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 78,183 | 75,283 |
Acquisitions | 700 | 2,900 |
Accumulated Amortization | (72,220) | (70,273) |
Currency Impact | (120) | (115) |
Net Book Value | 6,543 | 7,795 |
Noncompete agreements |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 6,262 | 5,962 |
Acquisitions | 100 | 300 |
Accumulated Amortization | (6,146) | (5,987) |
Currency Impact | 1 |  |
Net Book Value | 217 | 275 |
Software |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 1,660 | 1,660 |
Accumulated Amortization | (1,580) | (1,557) |
Net Book Value | 80 | 103 |
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 | (8,455) | (7,905) |
Currency Impact | (180) | (183) |
Net Book Value | 4,583 | 5,130 |
Trademark and trade name |  |  |
Intangible assets |  |  |
Gross Carrying Amount | 2,590 | 1,490 |
Acquisitions | 600 | 1,100 |
Accumulated Amortization | (1,998) | (1,513) |
Net Book Value | $ 1,192 | $ 1,077 |
Minimum | Customer relationships |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 2 years | 2 years |
Minimum | Noncompete agreements |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 4 years | 4 years |
Minimum | Software |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 3 years | 3 years |
Minimum | Backlog |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 1 year | 1 year |
Minimum | Databases |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 4 years | 4 years |
Minimum | Trademark and trade name |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 3 years | 3 years |
Maximum | Customer relationships |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 15 years | 15 years |
Maximum | Noncompete agreements |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 7 years | 7 years |
Maximum | Software |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 4 years | 4 years |
Maximum | Backlog |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 2 years | 2 years |
Maximum | Databases |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 15 years | 15 years |
Maximum | Trademark and trade name |  |  |
Intangible assets |  |  |
Estimated Useful Lives (in years) | 5 years | 5 years |

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