Income taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes
Valuation allowance	$ 540,196	$ 540,196	$ 539,527
Net deferred tax assets (net of valuation allowance)	953,676	953,676	657,597
Net deferred tax asset	951,037	951,037	656,772
Unrecognized tax benefits, accrued interest	2,600	2,600	2,800
Recognized Tax Benefits Current Interest On Income Taxes Accrued		268	892
Total amount of unrecognized tax benefits, that if recognized, would affect effective tax rate	4,300	4,300	5,500
Unrecognized Tax Benefits Expected Decreases Resulting From Settlements With Taxing Authorities	1,500	1,500
Income tax expense		132,330	309,018	$ 111,938
Interest Expense Reduction Due To Expiration Of The Statue Of Limitations		448	2,900
Reduction as a result of lapse of statute of limitations		1,000	11,300
Net operating loss and other carryforward available	782,886	782,886
Other liabilities
Income Taxes
Net deferred tax liabilities	2,600	2,600	825
PR
Income Taxes
Valuation allowance	137,863	137,863	128,557
Net deferred tax asset	$ 673,045	$ 673,045	407,537
Dividends Received Deduction From Controlled Subsidiary Percentage	100.00%	100.00%
Dividends Received Deductions From Other Taxable Domestic Corporations Percentage	85.00%	85.00%
Income tax expense		$ 132,330	309,018	$ 111,938
US
Income Taxes
Valuation allowance	$ 402,333	402,333	410,970
Net deferred tax asset	277,992	277,992	$ 249,235
Deferred Tax Assets	680,300	680,300
Valuation allowance deferred tax asset	68,200	68,200
US | Federal taxes
Income Taxes
Net operating loss and other carryforward available	525,000	525,000
US | State taxes
Income Taxes
Net operating loss and other carryforward available	$ 135,000	$ 135,000