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Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes
Income tax (benefit) expense	$ 22,177	$ 16,966	$ 37,964	$ 33,532
Increase in unrecognized tax benefits			1,700
Increase (decrease) noncurrent other liabilities			$ (100)

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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 noncurrent operating liabilities classified as other.

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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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