Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	$ 25,573	$ 22,728
Advanced Connectivity Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	0	0
Elastomeric Material Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	955	943
Power Electronics Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	22,652	19,738
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	$ 1,966	$ 2,047