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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 375,958 | $ 316,454
Accumulated Amortization | 171,858 | 145,061
Net Book Value | 204,100 | 171,393
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 240,756 | 197,641
Accumulated Amortization | 106,997 | 89,137
Net Book Value | 133,759 | 108,504
Covenants not-to-compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 24,973 | 20,309
Accumulated Amortization | 15,628 | 13,436
Net Book Value | 9,345 | 6,873
Trademarks and tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 89,804 | 79,657
Accumulated Amortization | 31,164 | 27,245
Net Book Value | 58,640 | 52,412
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 20,425 | 18,847
Accumulated Amortization | 18,069 | 15,243
Net Book Value | $ 2,356 | $ 3,604

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