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Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Taxes
Income tax (benefit) expense	$ 27,730	$ 11,695	$ 65,694	$ 45,227
Increase in unrecognized tax benefits			7,300
Increase (decrease) noncurrent other liabilities			$ 5,400

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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