Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	$ 27,315	$ 22,728
Advanced Connectivity Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	0
Elastomeric Material Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	764	943
Power Electronics Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	24,636	19,738
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	$ 1,915	$ 2,047