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Investment in Other Affiliates Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 41 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items]        
Investments in and advances to affiliates $ 20,699   $ 20,699 $ 18,884
Income (loss) from equity method investments $ (2,058) $ (1,623)    
Eicher -Polaris Private Limited        
Investments in and Advances to Affiliates [Line Items]        
Equity method investment ownership percentage 50.00%   50.00%  
Period for proportionate share of income (loss) to be reflected in consolidated financials 1 month      
Joint venture investment $ 50,000      
Investment Maturity Period 3 years      
Payments to acquire businesses and interest in affiliates     $ 39,121