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Investment in Other Affiliates Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates $ 1,000,000     $ 1,000,000   $ 6,133,000
Income (loss) from equity method investments $ (4,072,000) $ (111,000)   $ (5,133,000) $ (25,576,000)  
Cost-method Investments, Realized Gains     $ 13,478,000      
Eicher -Polaris Private Limited            
Investments in and Advances to Affiliates [Line Items]            
Income (loss) from equity method investments   $ 0     $ 23,447,000