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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 659,473 | $ 649,261
Accumulated Amortization | (386,403) | (372,081)
Intangible Assets, Net | $ 273,070 | 277,180
Remaining Weighted Average Amortization Period in Years | 7 years 9 months 18 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 662,473 | 652,261
Intangible Assets, Net | 276,070 | 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 | 358,177 | 359,967
Accumulated Amortization | (172,528) | (165,715)
Intangible Assets, Net | $ 185,649 | 194,252
Remaining Weighted Average Amortization Period in Years | 5 years 10 months 24 days |
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 136,780 | 135,578
Accumulated Amortization | (135,348) | (134,592)
Intangible Assets, Net | $ 1,432 | 986
Remaining Weighted Average Amortization Period in Years | 8 months 12 days |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 82,254 | 81,058
Accumulated Amortization | (22,916) | (21,559)
Intangible Assets, Net | $ 59,338 | 59,499
Remaining Weighted Average Amortization Period in Years | 15 years 2 months 12 days |
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 40,797 | 40,728
Accumulated Amortization | (29,905) | (30,168)
Intangible Assets, Net | $ 10,892 | 10,560
Remaining Weighted Average Amortization Period in Years | 3 years 3 months 18 days |
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 32,017 | 22,482
Accumulated Amortization | (24,597) | (19,175)
Intangible Assets, Net | $ 7,420 | 3,307
Remaining Weighted Average Amortization Period in Years | 2 years 7 months 6 days |
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 9,448 | 9,448
Accumulated Amortization | (1,109) | (872)
Intangible Assets, Net | $ 8,339 | $ 8,576
Remaining Weighted Average Amortization Period in Years | 8 years 9 months 18 days |

X
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