Financial Information by Segment - Schedule of Segment Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales from external customers	$ 202,648		$ 399,016		$ 538,655	$ 783,730
Adjusted EBITDA	15,238		71,528		79,082	136,095
Corporate charges	(6,089)		(4,501)		(8,412)	(10,137)
Depreciation and amortization of intangible assets and property, plant and equipment	(21,876)		(25,404)		(45,722)	(49,499)
Excluding equity in earnings of affiliated companies, net of tax	(151)		(153)		(285)	(290)
Income/(loss) from operations	(12,879)		41,470		24,664	76,169
Interest and other financial expense, net	(8,277)		(7,566)		(17,888)	(14,009)
Reclassification of actuarial losses from AOCI	(2,654)		0		(5,052)
Income tax expense/(benefit)	5,879		(9,309)		(1,756)	(18,748)
Equity in earnings of affiliated companies, net of tax	151		153		285	290
Net income/(loss)	(17,780)	$ 18,032	24,748	$ 18,954	253	43,702
Operating segments | Rubber
Segment Reporting Information [Line Items]
Net sales from external customers	108,261		259,731		324,489	512,859
Adjusted EBITDA	(1,233)		40,493		34,535	75,658
Depreciation and amortization of intangible assets and property, plant and equipment	(12,261)		(14,213)		(27,554)	(27,978)
Excluding equity in earnings of affiliated companies, net of tax	(151)		(153)		(285)	(290)
Income/(loss) from operations	(13,645)		26,127		6,697	47,390
Equity in earnings of affiliated companies, net of tax	151		153		285	290
Operating segments | Specialties
Segment Reporting Information [Line Items]
Net sales from external customers	94,388		139,285		214,167	270,871
Adjusted EBITDA	16,471		31,035		44,547	60,437
Depreciation and amortization of intangible assets and property, plant and equipment	(9,616)		(11,191)		(18,168)	(21,521)
Income/(loss) from operations	6,855		19,844		26,379	38,916
Corporate
Segment Reporting Information [Line Items]
Corporate charges	(6,089)		(4,501)		(8,412)	(10,137)
Income/(loss) from operations	(6,089)		(4,501)		(8,412)	(10,137)
Interest and other financial expense, net	(8,277)		(7,566)		(17,888)	(14,009)
Reclassification of actuarial losses from AOCI	(2,654)				(5,052)
Income tax expense/(benefit)	$ 5,879		$ (9,309)		$ (1,756)	$ (18,748)