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Equity method and other investments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Noncontrolling Interest [Line Items]
Equity investment income (loss)	$ 4,342	$ 4,514	$ 22,185	$ 7,222
Valuation Adjustment			$ 0	$ 0
Parent Company
Noncontrolling Interest [Line Items]
Ownership interest percentage by parent	75.00%		75.00%
Parent Company | Minimum
Noncontrolling Interest [Line Items]
Ownership interest percentage by parent	30.00%		30.00%
Parent Company | Maximum
Noncontrolling Interest [Line Items]
Ownership interest percentage by parent	50.00%		50.00%
APAC JV - Unrelated Noncontrolling Investor
Noncontrolling Interest [Line Items]
Current economic interest in the APAC JV, Owned by Noncontrolling Investors	25.00%		25.00%

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