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GRT Acquisition - Narrative (Details) - GRT Acquisition - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 04, 2016
Dec. 31, 2016
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    
Cooper Tire & Rubber Company consideration       $ 14,019
Subsequent Event        
Business Acquisition [Line Items]        
Working capital contribution     $ 35,846  
Consideration transferred     $ 85,745