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Income Taxes - Uncertain tax positions (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in unrecognized tax benefits        
Balance as of January 1 $ 34,016 $ 34,016 $ 45,452 $ 45,988
Additions for tax positions of prior years   322 2,207 806
Reductions for tax positions of prior years   (1,046) (256) (1,342)
Settlements (10,000) (9,968) (13,387)  
Balance as of December 31   23,324 34,016 45,452
Unrecognized tax benefits that would impact the worldwide effective tax rate if realized   23,300    
Interest and penalties on unrecognized tax benefits   8,200 11,100 17,000
Accruals for estimated interest and penalties related to uncertain tax positions   (2,900) (6,000) $ 2,600
Interest and penalties accrued $ 1,800      
Valuation allowance   3,825,551 $ 3,962,200  
Bermuda        
Change in unrecognized tax benefits        
Deferred tax asset for Bermuda net operating losses   206,900    
Valuation allowance   $ 206,900