Acquisitions - Narrative (Details) - USD ($) $ in Thousands					3 Months Ended	12 Months Ended
	Jan. 06, 2017	Nov. 23, 2016	Dec. 21, 2015	Jan. 22, 2015	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life						8 years 3 months 18 days
Amortization expense						$ 14,800	$ 11,200	$ 10,900
Estimated future amortization expense for 2018					$ 15,300	15,300
Estimated future amortization expense for 2019					15,100	15,100
Estimated future amortization expense for 2020					11,800	11,800
Estimated future amortization expense for 2021					11,100	11,100
Estimated future amortization expense for 2022					10,700	10,700
Proceeds from the sale of a business			$ 1,265			0	0	1,265
Loss on disposition of a business			$ 4,800			$ 0	0	$ 4,819
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life						9 years 7 months 6 days
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life						5 years 4 months 24 days
Covenant not to compete
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life						2 years 6 months
Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Purchase price	$ 60,200
Estimated future amortization expense for 2018					1,900	$ 1,900
Estimated future amortization expense for 2019					1,800	1,800
Estimated future amortization expense for 2020					1,800	1,800
Estimated future amortization expense for 2021					1,800	1,800
Estimated future amortization expense for 2022					1,700	1,700
Business acquisition, acquiree revenue					5,500	$ 22,300
Diversified Silicone Products, Inc. | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	30,500
Weighted average useful life						11 years 9 months 18 days
Diversified Silicone Products, Inc. | Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	1,800
Weighted average useful life						4 years 3 months 18 days
Diversified Silicone Products, Inc. | Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	3,300
Weighted average useful life						11 years 8 months 12 days
Diversified Silicone Products, Inc. | Covenant not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	300
Weighted average useful life						4 years 1 month 6 days
DeWAL
Finite-Lived Intangible Assets [Line Items]
Purchase price		$ 135,500
Cash from credit facility used to fund acquisition		136,000
Estimated future amortization expense for 2018					3,700	$ 3,700
Estimated future amortization expense for 2019					4,100	4,100
Estimated future amortization expense for 2020					4,300	4,300
Estimated future amortization expense for 2021					4,300	4,300
Estimated future amortization expense for 2022					4,300	4,300
Transaction costs						100	2,100
Business acquisition, acquiree revenue						$ 62,000	5,400
DeWAL | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		46,700
Weighted average useful life						13 years 6 months
DeWAL | Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		22,000
Weighted average useful life						8 years 7 months 6 days
DeWAL | Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		4,300
Weighted average useful life						5 years 2 months 12 days
DeWAL | Covenant not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 500
Weighted average useful life						3 years 9 months 18 days
Arlon
Finite-Lived Intangible Assets [Line Items]
Purchase price				$ 157,000
Cash from credit facility used to fund acquisition				125,000
Estimated future amortization expense for 2018					5,800	$ 5,800
Estimated future amortization expense for 2019					5,800	5,800
Estimated future amortization expense for 2020					$ 5,800	$ 5,800
Transaction costs							1,500
Business acquisition, acquiree revenue							100,000
Business acquisition, acquiree net income							$ 25,100
Arlon | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				32,700
Weighted average useful life						6 years
Arlon | Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				15,800
Weighted average useful life						5 years 8 months 12 days
Arlon | Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				$ 1,600
Weighted average useful life						3 years 2 months 12 days
Minimum | Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortization expense						$ 1,100
Minimum | DeWAL
Finite-Lived Intangible Assets [Line Items]
Amortization expense						2,400
Minimum | Arlon
Finite-Lived Intangible Assets [Line Items]
Amortization expense						1,800
Maximum | Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortization expense						2,000
Maximum | DeWAL
Finite-Lived Intangible Assets [Line Items]
Amortization expense						4,300
Maximum | Arlon
Finite-Lived Intangible Assets [Line Items]
Amortization expense						5,800
Revolving Credit Facility | Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Cash from credit facility used to fund acquisition	$ 30,000
Selling, General and Administrative Expenses | Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Transaction costs						$ 500