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Investment in Other Affiliates Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investment, Other than Temporary Impairment     $ 19,000    
Investments in and advances to affiliates $ 0   0   $ 18,616
Income (loss) from equity method investments $ (3,954) $ (1,336) (25,465) $ (3,236)  
Cost-method Investments, Realized Gains     $ 13,000    
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