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Investment in Other Affiliates Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates $ 5,072,000     $ 5,072,000   $ 6,133,000
Income (loss) from equity method investments $ (455,000) $ (3,954,000)   $ (1,061,000) $ (25,465,000)  
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   $ 3,817,000     $ 23,447,000