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Investment in Other Affiliates Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 5,527,000		$ 6,133,000
Income (loss) from equity method investments	$ (606,000)	$ (21,511,000)
Cost-method Investments, Realized Gains		13,000,000
Eicher -Polaris Private Limited
Investments in and Advances to Affiliates [Line Items]
Income (loss) from equity method investments		$ 19,630,000

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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