Restructuring - Restructuring and Related Costs (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 12,404,000	$ 8,818,000	$ 0
Restructuring Reserve [Roll Forward]
Accrued restructuring beginning balance	$ 1,398,000	1,398,000	0
Accrued restructuring ending balance		0	1,398,000	$ 0
Reduction in force - severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense		1,250,000	5,308,000
Restructuring Reserve [Roll Forward]
Accrued severance costs		(1,262,000)	6,630,000
Payment of severance costs		(136,000)	(5,368,000)
Reduction in force - other
Restructuring Cost and Reserve [Line Items]
Restructuring expense		224,000
COOCSA workforce services rendered
Restructuring Cost and Reserve [Line Items]
Restructuring expense		8,218,000
COOCSA professional and other costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense		2,712,000
Restructuring Reserve [Roll Forward]
Accrued severance costs			819,000
Payment of severance costs			(683,000)
Joint Venture
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 10,930,000	$ 12,404,000
Cooper Tire Europe asset write-downs & other costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense			2,248,000
Cooper Tire Asia employee severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense			1,262,000
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 759,000