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GRT Acquisition - Narrative (Details) - GRT Acquisition - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 18 Months Ended
Dec. 01, 2016
Dec. 31, 2016
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2017
Mar. 31, 2018
Business Acquisition [Line Items]              
Down payment         $ 5,929    
Ownership interest (as a percent) 65.00%            
Subsequent payment $ 8,090            
Working capital contribution   $ 35,842 $ 22,125 $ 14,570      
Consideration transferred           $ 86,556  
Cooper Tire & Rubber Company consideration $ 14,019           $ 14,019