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Income taxes (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019
Income taxes
Income tax expense	$ 21,065,000	$ 27,656,000		$ 29,484,000	$ 33,304,000
Effective income tax rate	26.00%	34.00%		25.00%	30.00%
Recorded net income tax benefits no longer deductible			$ 1,072,000			$ 6,228,000

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- Definition

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

+ References

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

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

+ References

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