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Intangible Assets (Schedule Of Indefinite-Lived And Definite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items] |  |
Cost | $ 458,422 | $ 348,404
Accumulated amortization | (157,474) | (115,024)
Net book value | 300,948 | 233,380
Trade Names and Trademarks [Member] |  |
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items] |  |
Cost | 53,871 | 53,319
Accumulated amortization | (1,595) | (2,028)
Net book value | 52,276 | 51,291
Customer Relationships [Member] |  |
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items] |  |
Cost | 196,407 | 124,865
Accumulated amortization | (47,752) | (34,666)
Net book value | 148,655 | 90,199
Computer Software, Intangible Asset [Member] |  |
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items] |  |
Cost | 206,829 | 157,776
Accumulated amortization | (108,127) | (78,330)
Net book value | 98,702 | 79,446
Software Under Development [Member] |  |
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items] |  |
Cost | 1,315 | 12,444
Net book value | $ 1,315 | $ 12,444

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