Financial Information by Segment - Schedule of Segment Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales from external customers	$ 282,036			$ 370,195			$ 820,691	$ 1,153,925
Adjusted EBITDA	55,002			68,054			134,084	204,149
Corporate charges	(6,714)			(7,543)			(15,125)	(17,680)
Depreciation and amortization of intangible assets and property, plant and equipment	(23,999)			(21,991)			(69,721)	(71,490)
Excluding equity in earnings of affiliated companies, net of tax	(141)			(134)			(426)	(424)
Income from operations	24,147			38,386			48,811	114,555
Interest and other financial expense, net	(10,769)			(6,500)			(28,657)	(20,509)
Reclassification of actuarial losses from AOCI	(2,272)			0			(7,325)
Income tax expense/(benefit)	(2,250)			(7,767)			(4,006)	(26,515)
Equity in earnings of affiliated companies, net of tax	141			134			426	424
Net income	8,997	$ (17,780)	$ 18,032	24,253	$ 24,748	$ 18,954	9,250	67,955
Operating segments | Rubber
Segment Reporting Information [Line Items]
Net sales from external customers	178,406			247,371			502,894	760,230
Adjusted EBITDA	28,525			38,097			63,060	113,755
Depreciation and amortization of intangible assets and property, plant and equipment	(13,828)			(13,524)			(41,382)	(41,502)
Excluding equity in earnings of affiliated companies, net of tax	(141)			(134)			(426)	(424)
Income from operations	14,556			24,439			21,253	71,829
Equity in earnings of affiliated companies, net of tax	141			134			426	424
Operating segments | Specialties
Segment Reporting Information [Line Items]
Net sales from external customers	103,630			122,824			317,797	393,695
Adjusted EBITDA	26,477			29,957			71,024	90,394
Depreciation and amortization of intangible assets and property, plant and equipment	(10,171)			(8,467)			(28,339)	(29,988)
Income from operations	16,305			21,490			42,684	60,406
Corporate
Segment Reporting Information [Line Items]
Corporate charges	(6,714)			(7,543)			(15,125)	(17,680)
Income from operations	(6,714)			(7,543)			(15,125)	(17,680)
Interest and other financial expense, net	(10,769)			(6,500)			(28,657)	(20,509)
Reclassification of actuarial losses from AOCI	(2,272)						(7,325)
Income tax expense/(benefit)	$ (2,250)			$ (7,767)			$ (4,006)	$ (26,515)