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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period | 7 years 1 month 6 days |
Intangible Assets | $ 922,835 | $ 848,620
Accumulated Amortization | (490,913) | (437,886)
Intangible Assets, Net | 431,922 | 410,734
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | 925,835 | 851,620
Intangible Assets, Net | 434,922 | 413,734
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 | 5 years 10 months 24 days |
Intangible Assets | $ 593,998 | 532,808
Accumulated Amortization | (257,585) | (213,915)
Intangible Assets, Net | $ 336,413 | 318,893
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period | 1 year 6 months |
Intangible Assets | $ 148,134 | 144,704
Accumulated Amortization | (142,743) | (141,580)
Intangible Assets, Net | $ 5,391 | 3,124
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period | 14 years 1 month 6 days |
Intangible Assets | $ 99,518 | 93,396
Accumulated Amortization | (30,620) | (26,145)
Intangible Assets, Net | $ 68,898 | 67,251
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period | 3 years 3 months 18 days |
Intangible Assets | $ 47,020 | 43,281
Accumulated Amortization | (35,603) | (32,868)
Intangible Assets, Net | $ 11,417 | 10,413
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period | 2 years 7 months 6 days |
Intangible Assets | $ 22,453 | 22,719
Accumulated Amortization | (21,557) | (20,682)
Intangible Assets, Net | $ 896 | 2,037
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remaining Weighted Average Amortization Period | 7 years 8 months 12 days |
Intangible Assets | $ 11,712 | 11,712
Accumulated Amortization | (2,805) | (2,696)
Intangible Assets, Net | $ 8,907 | $ 9,016

X
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