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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 661,642 | $ 649,261
Accumulated Amortization | (400,358) | (372,081)
Intangible Assets, Net | $ 261,284 | 277,180
Remaining Weighted Average Amortization Period in Years | 7 years 8 months 12 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 664,642 | 652,261
Intangible Assets, Net | 264,284 | 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 | 369,050 | 359,967
Accumulated Amortization | (187,450) | (165,715)
Intangible Assets, Net | $ 181,600 | 194,252
Remaining Weighted Average Amortization Period in Years | 5 years 8 months 12 days |
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 137,256 | 135,578
Accumulated Amortization | (136,433) | (134,592)
Intangible Assets, Net | $ 823 | 986
Remaining Weighted Average Amortization Period in Years | 18 days |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 82,454 | 81,058
Accumulated Amortization | (24,286) | (21,559)
Intangible Assets, Net | $ 58,168 | 59,499
Remaining Weighted Average Amortization Period in Years | 15 years |
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 40,902 | 40,728
Accumulated Amortization | (30,902) | (30,168)
Intangible Assets, Net | $ 10,000 | 10,560
Remaining Weighted Average Amortization Period in Years | 3 years 1 month 6 days |
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 22,532 | 22,482
Accumulated Amortization | (19,939) | (19,175)
Intangible Assets, Net | $ 2,593 | 3,307
Remaining Weighted Average Amortization Period in Years | 2 years 4 months 24 days |
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 9,448 | 9,448
Accumulated Amortization | (1,348) | (872)
Intangible Assets, Net | $ 8,100 | $ 8,576
Remaining Weighted Average Amortization Period in Years | 8 years 7 months 6 days |

X
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