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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	7 years 3 months 18 days
Intangible Assets	$ 846,315	$ 848,620
Accumulated Amortization	(469,006)	(437,886)
Intangible Assets, Net	377,309	410,734
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets	849,315	851,620
Intangible Assets, Net	380,309	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	6 years
Intangible Assets	$ 531,823	532,808
Accumulated Amortization	(240,578)	(213,915)
Intangible Assets, Net	$ 291,245	318,893
Backlog
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	2 years 3 months 18 days
Intangible Assets	$ 143,615	144,704
Accumulated Amortization	(141,212)	(141,580)
Intangible Assets, Net	$ 2,403	3,124
Trade names
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	14 years 3 months 18 days
Intangible Assets	$ 93,007	93,396
Accumulated Amortization	(29,087)	(26,145)
Intangible Assets, Net	$ 63,920	67,251
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	3 years
Intangible Assets	$ 43,718	43,281
Accumulated Amortization	(34,446)	(32,868)
Intangible Assets, Net	$ 9,272	10,413
Patented rights and developed technology
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	2 years 3 months 18 days
Intangible Assets	$ 22,440	22,719
Accumulated Amortization	(21,173)	(20,682)
Intangible Assets, Net	$ 1,267	2,037
Curriculum
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	7 years 10 months 24 days
Intangible Assets	$ 11,712	11,712
Accumulated Amortization	(2,510)	(2,696)
Intangible Assets, Net	$ 9,202	$ 9,016

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