Goodwill and Other Intangible Assets, Net (Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 197,846	$ 84,214
Accumulated Amortization	(47,648)	(30,775)
Intangible assets amortization expense	15,700	4,500	$ 7,000
Impairment of Intangible Assets, Finite-lived	0	0	10,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
2019	10,341
2020	9,870
2021	9,589
2022	9,231
2023	9,190
Customer lists / relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	128,882	56,789
Accumulated Amortization	$ (30,094)	(21,415)
Customer lists / relationships | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	6 years
Customer lists / relationships | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	38 years
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 45,798	19,552
Accumulated Amortization	$ (9,665)	(5,217)
Developed technologies | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	7 years
Developed technologies | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	20 years
Trademarks / trade names
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 17,353	5,012
Accumulated Amortization	$ (2,149)	(1,368)
Trademarks / trade names | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years
Trademarks / trade names | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	40 years
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 5,290	2,338
Accumulated Amortization	$ (5,276)	(2,321)
Noncompete agreements | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	1 year
Noncompete agreements | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years
Patents
Finite-Lived Intangible Assets [Line Items]
Amortization Period	17 years
Gross Amount	$ 523	523
Accumulated Amortization	$ (464)	$ (454)
U.K. Composites [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived			10,000
U.K. Composites [Member] | Customer lists / relationships
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization			(11,000)
Intangible Assets, Gross (Excluding Goodwill)			$ 21,000