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Income taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes      
Valuation allowance $ 539,527 $ 520,096  
Net deferred tax assets (net of valuation allowance) 657,597 851,592  
Net deferred tax asset 656,772 850,695  
Unrecognized tax benefits, accrued interest 2,800 4,800  
Recognized Tax Benefits Current Interest On Income Taxes Accrued 892 2,000  
Total amount of unrecognized tax benefits, that if recognized, would affect effective tax rate 5,500 10,200  
Unrecognized Tax Benefits Expected Decreases Resulting From Settlements With Taxing Authorities 1,400    
Income tax expense 309,018 111,938 $ 147,181
Interest Expense Reduction Due To Expiration Of The Statue Of Limitations 2,900 645 26,000
Other liabilities      
Income Taxes      
Net deferred tax liabilities 825 897  
PR      
Income Taxes      
Valuation allowance 128,557 112,871  
Net deferred tax asset $ 407,537 549,290  
Dividends Received Deduction From Controlled Subsidiary Percentage 100.00%    
Dividends Received Deductions From Other Taxable Domestic Corporations Percentage 85.00%    
Income tax expense $ 309,018 111,938 $ 147,181
US      
Income Taxes      
Valuation allowance 410,970 407,225  
Net deferred tax asset 249,235 $ 301,405  
Deferred Tax Assets $ 660,000