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Equity method and other investments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Noncontrolling Interest [Line Items]
Equity investment income	$ 2,708	$ 155
Valuation Adjustment	$ 0
Minimum
Noncontrolling Interest [Line Items]
Current economic interest in the APAC JV, Owned by the Parent Company	30.00%
Maximum
Noncontrolling Interest [Line Items]
Current economic interest in the APAC JV, Owned by the Parent Company	50.00%

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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