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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 842,716 | $ 649,261
Accumulated Amortization | (414,153) | (372,081)
Intangible Assets, Net | $ 428,563 | 277,180
Remaining Weighted Average Amortization Period in Years | 7 years 9 months 18 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 845,716 | 652,261
Intangible Assets, Net | 431,563 | 280,180
Engineering license |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | 3,000 | 3,000
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 531,813 | 359,967
Accumulated Amortization | (197,646) | (165,715)
Intangible Assets, Net | $ 334,167 | 194,252
Remaining Weighted Average Amortization Period in Years | 6 years 8 months 12 days |
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 140,984 | 135,578
Accumulated Amortization | (137,454) | (134,592)
Intangible Assets, Net | $ 3,530 | 986
Remaining Weighted Average Amortization Period in Years | 3 months 18 days |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 93,021 | 81,058
Accumulated Amortization | (25,379) | (21,559)
Intangible Assets, Net | $ 67,642 | 59,499
Remaining Weighted Average Amortization Period in Years | 14 years 10 months 24 days |
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 43,157 | 40,728
Accumulated Amortization | (31,754) | (30,168)
Intangible Assets, Net | $ 11,403 | 10,560
Remaining Weighted Average Amortization Period in Years | 3 years 4 months 24 days |
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 22,511 | 22,482
Accumulated Amortization | (20,297) | (19,175)
Intangible Assets, Net | $ 2,214 | 3,307
Remaining Weighted Average Amortization Period in Years | 2 years 3 months 18 days |
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 11,230 | 9,448
Accumulated Amortization | (1,623) | (872)
Intangible Assets, Net | $ 9,607 | $ 8,576
Remaining Weighted Average Amortization Period in Years | 8 years 7 months 6 days |

X
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