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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 950,229	$ 848,620
Accumulated Amortization	(517,574)	(437,886)
Finite-Lived Intangible Assets, Net	$ 432,655	410,734
Remaining Weighted Average Amortization Period	6 years 9 months 18 days
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets	$ 953,229	851,620
Intangible Assets, Net	435,655	413,734
Engineering license
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets	3,000	3,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	616,875	532,808
Accumulated Amortization	(277,647)	(213,915)
Finite-Lived Intangible Assets, Net	$ 339,228	318,893
Remaining Weighted Average Amortization Period	5 years 7 months 6 days
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 149,769	144,704
Accumulated Amortization	(145,476)	(141,580)
Finite-Lived Intangible Assets, Net	$ 4,293	3,124
Remaining Weighted Average Amortization Period	1 year 3 months 18 days
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 101,533	93,396
Accumulated Amortization	(32,471)	(26,145)
Finite-Lived Intangible Assets, Net	$ 69,062	67,251
Remaining Weighted Average Amortization Period	13 years 9 months 18 days
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 47,333	43,281
Accumulated Amortization	(36,973)	(32,868)
Finite-Lived Intangible Assets, Net	$ 10,360	10,413
Remaining Weighted Average Amortization Period	3 years 1 month 6 days
Patented rights and developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 22,486	22,719
Accumulated Amortization	(21,894)	(20,682)
Finite-Lived Intangible Assets, Net	$ 592	2,037
Remaining Weighted Average Amortization Period	3 years 6 months
Curriculum
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 12,233	11,712
Accumulated Amortization	(3,113)	(2,696)
Finite-Lived Intangible Assets, Net	$ 9,120	$ 9,016
Remaining Weighted Average Amortization Period	7 years 4 months 24 days

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