Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Increase in net contract assets				$ 5,600
Increase in contract liabilities				400
Revenue recognized from contracts with customers				2,500
Effect on revenue		$ 197,886	$ 180,041	575,959	$ 520,407
Effect on gross profit		35,139	40,054	110,773	123,879
Effect on cost of goods sold		162,747	$ 139,987	465,186	$ 396,528
Interface
Disaggregation of Revenue [Line Items]
Increase in net contract assets				200
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Effect on revenue	$ 19,600	(1,063)		6,799
Effect on gross profit		983		1,341
Effect on cost of goods sold		(2,046)		$ 5,458
Thermal Acoustical Solutions | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Effect on revenue	$ 16,300	(1,100)
Effect on gross profit		1,000
Tooling | Thermal Acoustical Solutions | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Effect on revenue		(5,000)
Effect on cost of goods sold		(5,000)
Non-Tooling | Thermal Acoustical Solutions | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Effect on revenue		(3,900)
Effect on gross profit		$ 1,000