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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 341,659 | $ 316,454
Accumulated Amortization | 153,457 | 145,061
Net Book Value | 188,202 | 171,393
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 215,841 | 197,641
Accumulated Amortization | 94,790 | 89,137
Net Book Value | 121,051 | 108,504
Covenants not-to-compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 22,914 | 20,309
Accumulated Amortization | 14,127 | 13,436
Net Book Value | 8,787 | 6,873
Trademarks and tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 84,057 | 79,657
Accumulated Amortization | 28,488 | 27,245
Net Book Value | 55,569 | 52,412
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 18,847 | 18,847
Accumulated Amortization | 16,052 | 15,243
Net Book Value | $ 2,795 | $ 3,604

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