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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

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