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Investment in Other Affiliates Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Investments in and advances to affiliates | $ 0 |  | $ 0 |  | $ 18,616,000
Income (loss) from equity method investments | $ (111,000) | $ (1,603,000) | (25,576,000) | $ (4,839,000) |
Cost-method Investments, Realized Gains |  |  | $ 13,000,000 |  |
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 |  |
Equity Method Investment, Other than Temporary Impairment |  |  | $ 19,000,000 |  |
Income (loss) from equity method investments | $ 0 |  | $ 23,447,000 |  |

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