Financial Information by Segment & Geographic Area - Schedule of Segment Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales from external customers	$ 322,428	$ 370,195	$ 399,016	$ 384,714	$ 385,964	$ 393,954	$ 391,586	$ 406,699	$ 1,476,353	$ 1,578,203	$ 1,328,297
Adjusted EBITDA									267,337	294,142	256,978
Corporate charges									(22,916)	910	(20,204)
Depreciation and amortization of intangible assets and property, plant and equipment									(96,713)	(98,156)	(98,356)
Excluding equity in earnings of affiliated companies, net of tax									(558)	(591)	(547)
Income from operations	32,596	38,386	41,470	34,699	26,672	41,843	82,457	45,333	147,151	196,305	137,871
Interest and other financial expense, net									(27,572)	(28,642)	(44,135)
Reclassification of actuarial losses from AOCI									0	0	(9,687)
Income tax expense									(33,216)	(46,944)	(19,736)
Net income	18,965	$ 24,253	$ 24,748	$ 18,954	15,658	$ 25,817	$ 53,081	$ 26,754	86,920	121,310	64,860
Assets	1,257,394				1,273,022				1,257,394	1,273,022	1,164,366
Total expenditures for additions to long-lived assets									158,703	111,057	98,981
Operating segments | Rubber
Segment Reporting Information [Line Items]
Net sales from external customers									967,899	1,032,818	849,410
Adjusted EBITDA									145,170	144,887	111,490
Depreciation and amortization of intangible assets and property, plant and equipment									(58,645)	(57,127)	(60,403)
Excluding equity in earnings of affiliated companies, net of tax									(558)	(591)	(547)
Income from operations									85,967	87,169	50,540
Assets	696,516				685,243				696,516	685,243	610,782
Total expenditures for additions to long-lived assets									132,556	67,885	52,584
Operating segments | Specialties
Segment Reporting Information [Line Items]
Net sales from external customers									508,454	545,385	478,887
Adjusted EBITDA									122,167	149,255	145,488
Depreciation and amortization of intangible assets and property, plant and equipment									(38,067)	(41,029)	(37,953)
Income from operations									84,100	108,226	107,535
Assets	417,834				436,337				417,834	436,337	357,492
Total expenditures for additions to long-lived assets									26,147	43,171	46,397
Corporate and other
Segment Reporting Information [Line Items]
Adjusted EBITDA											0
Corporate charges									(22,916)	910	(20,204)
Income from operations									(22,916)	910	(20,204)
Interest and other financial expense, net									(27,572)	(28,642)	(44,135)
Reclassification of actuarial losses from AOCI											(9,687)
Income tax expense									(33,216)	(46,944)	(19,736)
Assets	$ 143,043				$ 151,442				$ 143,043	$ 151,442	$ 196,092