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Reserve for Losses and Loss Adjustment Expenses - Prior year development (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) $ 41,672 $ 19,023
Underwriting segments | Insurance    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) $ 4,100 $ 1,100
Percentage of prior year development 0.50% 0.20%
Underwriting segments | Insurance | Short tailed lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) $ 25,000 $ 3,900
Underwriting segments | Insurance | Short tailed lines | Property insurance    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) 14,600  
Underwriting segments | Insurance | Short tailed lines | Travel and accident    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) 2,500  
Underwriting segments | Insurance | Short tailed lines | Lenders products    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) 8,000  
Underwriting segments | Insurance | Medium tailed lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) (20,900) (7,900)
Underwriting segments | Insurance | Medium tailed lines | Programs    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) (10,800)  
Underwriting segments | Insurance | Medium tailed lines | Professional liability    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) (6,000) 5,100
Underwriting segments | Insurance | Medium tailed lines | Contract binding    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable)   (13,200)
Underwriting segments | Insurance | Medium tailed lines | Surety Line of Business    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) (5,000)  
Underwriting segments | Insurance | Long tailed lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable)   5,200
Underwriting segments | Reinsurance    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) $ 26,800 $ 11,600
Percentage of prior year development 4.20% 2.10%
Underwriting segments | Reinsurance | Short tailed lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) $ 17,500  
Underwriting segments | Reinsurance | Short tailed lines | Property catastrophe and property other than property catastrophe    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) 23,300  
Underwriting segments | Reinsurance | Short tailed lines | Property catastrophe    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) (22,500)  
Underwriting segments | Reinsurance | Short tailed lines | Other specialty lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) 16,600  
Underwriting segments | Reinsurance | Short tailed and medium tailed lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable)   $ 21,500
Underwriting segments | Reinsurance | Short tailed and medium tailed lines | Property catastrophe and property other than property catastrophe    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable)   (4,300)
Underwriting segments | Reinsurance | Short tailed and medium tailed lines | Property catastrophe    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable)   10,500
Underwriting segments | Reinsurance | Short tailed and medium tailed lines | Other specialty lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable)   11,900
Underwriting segments | Reinsurance | Medium tailed and long tailed lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) 9,300  
Underwriting segments | Reinsurance | Long tailed lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable)   (9,900)
Underwriting segments | Mortgage    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) $ 10,900 $ 6,100
Percentage of prior year development 3.20% 1.80%
Underwriting segments | Other    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development favorable (unfavorable) $ (100) $ 200