Goodwill and Other Intangible Assets, Net (Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 84,214	$ 84,982
Accumulated Amortization	(30,775)	(26,415)
Intangible assets amortization expense	4,500	7,000	$ 7,500
Impairment of Intangible Assets, Finite-lived	0	10,039	$ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
2019	4,559
2020	4,524
2021	4,137
2022	4,118
2023	3,908
Customer lists / relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	56,789	57,263
Accumulated Amortization	$ (21,415)	(18,587)
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	26 years
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 19,552	19,729
Accumulated Amortization	$ (5,217)	(3,998)
Developed technologies | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 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	$ 5,012	5,117
Accumulated Amortization	$ (1,368)	(1,055)
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	17 years
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 2,338	2,350
Accumulated Amortization	$ (2,321)	(2,330)
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	$ (454)	(445)
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)
Other intangible assets net		$ 21,000