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Investment in Other Affiliates Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 44 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates $ 22,030   $ 22,030   $ 22,030 $ 18,884
Income (loss) from equity method investments $ (1,583) $ (1,748) $ (3,641) $ (3,371)    
Eicher -Polaris Private Limited            
Investments in and Advances to Affiliates [Line Items]            
Equity method investment ownership percentage 50.00%   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         $ 41,560