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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (intangibles) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amortizable intangibles [Line Items] |  |  |
Gross carrying amount | $ 1,166,934 | $ 1,282,568 |
Accumulated amortization | (775,190) | (823,589) |
Net carrying amount | 391,744 | 458,979 |
Amortization of intangibles | 146,277 | 146,555 | $ 123,142
Acquired intangibles | $ 82,734 | $ 94,632 | $ 384,655
Weighted-average amortization period (in years) | 4 years | 4 years | 8 years
Estimated future amortization expense |  |  |
2024 | $ 107,127 |  |
2025 | 75,217 |  |
2026 | 48,604 |  |
2027 | 37,075 |  |
2028 | 28,806 |  |
Internal-use software [Member] |  |  |
Amortizable intangibles [Line Items] |  |  |
Gross carrying amount | 554,825 | $ 529,306 |
Accumulated amortization | (412,364) | (395,514) |
Net carrying amount | 142,461 | 133,792 |
Acquired intangibles | $ 81,349 | $ 74,778 | $ 75,918
Weighted-average amortization period (in years) | 4 years | 3 years | 3 years
Customer lists/relationships [Member] |  |  |
Amortizable intangibles [Line Items] |  |  |
Gross carrying amount | $ 363,298 | $ 497,882 |
Accumulated amortization | (235,557) | (312,986) |
Net carrying amount | 127,741 | 184,896 |
Acquired intangibles | 0 | $ 18,267 | $ 149,642
Weighted-average amortization period (in years) |  | 6 years | 8 years
Technology-based intangibles [Member] |  |  |
Amortizable intangibles [Line Items] |  |  |
Gross carrying amount | 97,633 | $ 99,613 |
Accumulated amortization | (54,251) | (47,478) |
Net carrying amount | 43,382 | 52,135 |
Acquired intangibles | 0 | 0 | $ 65,000
Weighted-average amortization period (in years) |  |  | 8 years
Partner relationships [Member] |  |  |
Amortizable intangibles [Line Items] |  |  |
Gross carrying amount | 74,911 | 74,682 |
Accumulated amortization | (14,031) | (9,094) |
Net carrying amount | 60,880 | 65,588 |
Acquired intangibles | $ 1,385 | $ 1,587 | $ 73,095
Weighted-average amortization period (in years) | 2 years | 3 years | 15 years
Trade names [Member] |  |  |
Amortizable intangibles [Line Items] |  |  |
Gross carrying amount | $ 39,367 | $ 44,185 |
Accumulated amortization | (23,792) | (26,510) |
Net carrying amount | 15,575 | 17,675 |
Acquired intangibles | 0 | 0 | $ 21,000
Weighted-average amortization period (in years) |  |  | 10 years
Software to be sold [Member] |  |  |
Amortizable intangibles [Line Items] |  |  |
Gross carrying amount | 36,900 | 36,900 |
Accumulated amortization | (35,195) | (32,007) |
Net carrying amount | $ 1,705 | $ 4,893 |

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