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INTANGIBLE ASSETS - Summary of Acquired Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 7,253,122 | $ 7,190,428
Accumulated Amortization | (4,736,420) | (4,409,312)
Net Carrying Amount | 2,516,702 | 2,781,116
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,113,669 | 6,052,598
Accumulated Amortization | (3,755,385) | (3,478,742)
Net Carrying Amount | 2,358,284 | 2,573,856
Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,081,083 | 1,081,083
Accumulated Amortization | (941,429) | (894,189)
Net Carrying Amount | 139,654 | 186,894
Other amortizable intangibles |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 58,370 | 56,747
Accumulated Amortization | (39,606) | (36,381)
Net Carrying Amount | $ 18,764 | $ 20,366
Minimum | Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible asset, useful life | 3 years |
Minimum | Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible asset, useful life | 2 years |
Minimum | Other amortizable intangibles |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible asset, useful life | 1 year |
Maximum | Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible asset, useful life | 18 years |
Maximum | Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible asset, useful life | 5 years |
Maximum | Other amortizable intangibles |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible asset, useful life | 15 years |

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