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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period in Years | 6 years 8 months 12 days |
Intangible Assets | $ 952,108 | $ 950,229
Accumulated Amortization | (539,986) | (517,574)
Intangible Assets, Net | 412,122 | 432,655
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | 955,108 | 953,229
Intangible Assets, Net | 415,122 | 435,655
Engineering license |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 3,000 | 3,000
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period in Years | 5 years 4 months 24 days |
Intangible Assets | $ 618,035 | 616,875
Accumulated Amortization | (295,700) | (277,647)
Intangible Assets, Net | $ 322,335 | 339,228
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period in Years | 1 year 1 month 6 days |
Intangible Assets | $ 150,096 | 149,769
Accumulated Amortization | (146,852) | (145,476)
Intangible Assets, Net | $ 3,244 | 4,293
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period in Years | 13 years 7 months 6 days |
Intangible Assets | $ 101,711 | 101,533
Accumulated Amortization | (33,960) | (32,471)
Intangible Assets, Net | $ 67,751 | 69,062
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period in Years | 3 years |
Intangible Assets | $ 47,537 | 47,333
Accumulated Amortization | (38,105) | (36,973)
Intangible Assets, Net | $ 9,432 | 10,360
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period in Years | 3 years 3 months 18 days |
Intangible Assets | $ 22,496 | 22,486
Accumulated Amortization | (21,940) | (21,894)
Intangible Assets, Net | $ 556 | 592
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period in Years | 7 years 1 month 6 days |
Intangible Assets | $ 12,233 | 12,233
Accumulated Amortization | (3,429) | (3,113)
Intangible Assets, Net | $ 8,804 | $ 9,120

X
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