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GRT Acquisition - Narrative (Details) - GRT Acquisition - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 04, 2016
Dec. 31, 2016
Mar. 31, 2017
Dec. 31, 2017
Dec. 01, 2016
Business Acquisition [Line Items]          
Down payment $ 5,929        
Ownership interest (as a percent) 65.00%       56.20%
Subsequent payment $ 8,090        
Working capital contribution   $ 35,842 $ 14,570    
Cooper Tire & Rubber Company consideration         $ 14,019
Subsequent Event          
Business Acquisition [Line Items]          
Working capital contribution       $ 21,791  
Consideration transferred       $ 86,222