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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 950,229 | $ 848,620
Accumulated Amortization | (517,574) | (437,886)
Finite-Lived Intangible Assets, Net | $ 432,655 | 410,734
Remaining Weighted Average Amortization Period | 6 years 9 months 18 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 953,229 | 851,620
Intangible Assets, Net | 435,655 | 413,734
Engineering license |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | 3,000 | 3,000
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 616,875 | 532,808
Accumulated Amortization | (277,647) | (213,915)
Finite-Lived Intangible Assets, Net | $ 339,228 | 318,893
Remaining Weighted Average Amortization Period | 5 years 7 months 6 days |
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 149,769 | 144,704
Accumulated Amortization | (145,476) | (141,580)
Finite-Lived Intangible Assets, Net | $ 4,293 | 3,124
Remaining Weighted Average Amortization Period | 1 year 3 months 18 days |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 101,533 | 93,396
Accumulated Amortization | (32,471) | (26,145)
Finite-Lived Intangible Assets, Net | $ 69,062 | 67,251
Remaining Weighted Average Amortization Period | 13 years 9 months 18 days |
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 47,333 | 43,281
Accumulated Amortization | (36,973) | (32,868)
Finite-Lived Intangible Assets, Net | $ 10,360 | 10,413
Remaining Weighted Average Amortization Period | 3 years 1 month 6 days |
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 22,486 | 22,719
Accumulated Amortization | (21,894) | (20,682)
Finite-Lived Intangible Assets, Net | $ 592 | 2,037
Remaining Weighted Average Amortization Period | 3 years 6 months |
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 12,233 | 11,712
Accumulated Amortization | (3,113) | (2,696)
Finite-Lived Intangible Assets, Net | $ 9,120 | $ 9,016
Remaining Weighted Average Amortization Period | 7 years 4 months 24 days |

X
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