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INTANGIBLE ASSETS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Goodwill | $ 529,463,000 | $ 523,998,000 | $ 447,995,000
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 529,463,000 | 523,998,000 | 447,995,000
Goodwill impairment | 1,228,000 |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Carrying Amount | 330,063,000 | 323,848,000 |
Accumulated Amortization | 208,403,000 | 179,924,000 |
Identifiable intangible assets | 0 | 0 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
Amortization of identifiable intangible assets | 27,811,000 | 25,789,000 | $ 24,988,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2021 | 24,392,000 |  |
2022 | 22,430,000 |  |
2023 | 19,501,000 |  |
2024 | 10,800,000 |  |
2025 | 6,540,000 |  |
Customer relationships and lists |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Carrying Amount | 243,557,000 | 239,578,000 |
Accumulated Amortization | $ 158,051,000 | 139,863,000 |
Customer relationships and lists | Minimum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 10 years |  |
Customer relationships and lists | Maximum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 20 years |  |
Trademarks & trade names |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Carrying Amount | $ 43,208,000 | 43,102,000 |
Accumulated Amortization | $ 24,974,000 | 20,477,000 |
Trademarks & trade names | Minimum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 2 years |  |
Trademarks & trade names | Maximum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 17 years |  |
Developed technology |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Carrying Amount | $ 21,674,000 | 20,206,000 |
Accumulated Amortization | $ 13,693,000 | 11,008,000 |
Developed technology | Minimum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 5 years |  |
Developed technology | Maximum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 12 years |  |
Other |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Carrying Amount | $ 21,624,000 | 20,962,000 |
Accumulated Amortization | $ 11,685,000 | $ 8,576,000 |
Other | Minimum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 3 years |  |
Other | Maximum |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization Period | 18 years |  |

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