Operating Segment Information - Income by Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 191,157	$ 242,852	$ 389,967	$ 482,650
Operating income	21,092	33,213	38,567	66,013
Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	70,940	92,529	135,493	172,999
Operating income	15,624	18,458	21,086	31,522
Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	71,626	93,894	155,152	186,656
Operating income	2,995	15,326	14,512	28,757
Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	45,220	51,662	91,941	111,476
Operating income	1,446	(1,884)	762	2,383
Other
Segment Reporting Information [Line Items]
Net sales	3,371	4,767	7,381	11,519
Operating income	1,027	1,313	2,207	3,351
Recognized over time
Segment Reporting Information [Line Items]
Net sales	50,804	58,597	103,682	125,809
Recognized over time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Recognized over time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	2,667	2,965	5,494	5,971
Recognized over time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	45,060	51,319	91,461	110,921
Recognized over time | Other
Segment Reporting Information [Line Items]
Net sales	3,077	4,313	6,727	8,917
Recognized at a point in time
Segment Reporting Information [Line Items]
Net sales	140,353	184,255	286,285	356,841
Recognized at a point in time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	70,940	92,529	135,493	172,999
Recognized at a point in time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	68,959	90,929	149,658	180,685
Recognized at a point in time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	160	343	480	555
Recognized at a point in time | Other
Segment Reporting Information [Line Items]
Net sales	294	454	654	2,602
United States
Segment Reporting Information [Line Items]
Net sales	53,665	66,929	115,836	132,232
United States | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	17,396	16,272	31,849	29,343
United States | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	30,073	41,370	68,640	84,835
United States | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	5,489	8,208	13,661	15,685
United States | Other
Segment Reporting Information [Line Items]
Net sales	707	1,079	1,686	2,369
Other Americas
Segment Reporting Information [Line Items]
Net sales	2,474	3,664	6,287	6,710
Other Americas | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	681	1,039	1,625	1,791
Other Americas | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	1,668	2,190	4,117	4,273
Other Americas | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	77	229	186	249
Other Americas | Other
Segment Reporting Information [Line Items]
Net sales	48	206	359	397
Total Americas
Segment Reporting Information [Line Items]
Net sales	56,139	70,593	122,123	138,942
Total Americas | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	18,077	17,311	33,474	31,134
Total Americas | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	31,741	43,560	72,757	89,108
Total Americas | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	5,566	8,437	13,847	15,934
Total Americas | Other
Segment Reporting Information [Line Items]
Net sales	755	1,285	2,045	2,766
China
Segment Reporting Information [Line Items]
Net sales	65,883	85,415	117,416	163,900
China | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	35,580	49,333	60,205	91,822
China | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	20,159	23,846	38,534	46,265
China | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	9,120	11,283	17,428	22,347
China | Other
Segment Reporting Information [Line Items]
Net sales	1,024	953	1,249	3,466
Other APAC
Segment Reporting Information [Line Items]
Net sales	23,727	39,945	56,907	74,721
Other APAC | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	8,575	17,026	23,894	31,167
Other APAC | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	9,835	15,534	22,788	30,022
Other APAC | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	4,864	6,625	9,224	11,963
Other APAC | Other
Segment Reporting Information [Line Items]
Net sales	453	760	1,001	1,569
Total APAC
Segment Reporting Information [Line Items]
Net sales	89,610	125,360	174,323	238,621
Total APAC | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	44,155	66,359	84,099	122,989
Total APAC | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	29,994	39,380	61,322	76,287
Total APAC | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	13,984	17,908	26,652	34,310
Total APAC | Other
Segment Reporting Information [Line Items]
Net sales	1,477	1,713	2,250	5,035
Germany
Segment Reporting Information [Line Items]
Net sales	23,250	21,857	43,762	51,858
Germany | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	2,708	3,951	6,381	8,423
Germany | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	4,799	3,471	8,433	6,907
Germany | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	15,699	14,305	28,755	36,252
Germany | Other
Segment Reporting Information [Line Items]
Net sales	44	130	193	276
Other EMEA
Segment Reporting Information [Line Items]
Net sales	22,158	25,042	49,759	53,229
Other EMEA | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	6,000	4,908	11,539	10,453
Other EMEA | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	5,092	7,483	12,640	14,354
Other EMEA | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	9,971	11,012	22,687	24,980
Other EMEA | Other
Segment Reporting Information [Line Items]
Net sales	1,095	1,639	2,893	3,442
Total EMEA
Segment Reporting Information [Line Items]
Net sales	45,408	46,899	93,521	105,087
Total EMEA | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	8,708	8,859	17,920	18,876
Total EMEA | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	9,891	10,954	21,073	21,261
Total EMEA | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	25,670	25,317	51,442	61,232
Total EMEA | Other
Segment Reporting Information [Line Items]
Net sales	$ 1,139	$ 1,769	$ 3,086	$ 3,718