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Reserve for Losses and Loss Adjustment Expenses - Prior year development (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 44,067 $ 38,185 $ 63,090 $ 77,617
Underwriting segments | Insurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 2,500 $ 2,600 $ 3,600 $ 7,000
Percentage of prior year development 0.40% 0.40% 0.30% 0.60%
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) $ 11,500 $ 8,000 $ 15,400 $ 17,700
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) 7,500   9,600  
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) 3,500      
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)     3,100  
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) (17,100) (10,400) (25,100) (17,300)
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) (4,000) (15,500) (6,300) (23,200)
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) (6,100)   (19,300) (9,700)
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) (6,300)      
Underwriting segments | Insurance | Medium tailed lines | Other product lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   5,100   15,600
Underwriting segments | Insurance | Short 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) 19,700   28,700  
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) 8,100 4,900 13,300 6,600
Underwriting segments | Insurance | Long tailed lines | Executive assurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 2,400 5,100   5,700
Underwriting segments | Insurance | Long tailed lines | Other product lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 4,900   7,600  
Underwriting segments | Reinsurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 40,200 $ 12,700 $ 51,800 $ 11,000
Percentage of prior year development 8.40% 3.50% 5.10% 1.50%
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) $ 46,200 $ 1,800 $ 65,700 $ (4,300)
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) 18,300     (17,900)
Underwriting segments | Reinsurance | Short tailed lines | Property catastrophe and property other than property catastrophe | Typhoon Jebi        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)       (16,000)
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) 27,500     10,200
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)     67,400  
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)     21,300  
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)     39,300  
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) (6,000) 10,900   15,300
Underwriting segments | Reinsurance | Medium tailed and long tailed lines | Casualty        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)       9,100
Underwriting segments | Reinsurance | Medium tailed and long tailed lines | Marine        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)       6,200
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)     (15,600)  
Underwriting segments | Reinsurance | Long tailed lines | Casualty        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) (5,800)      
Underwriting segments | Mortgage        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 200 $ 22,800 $ 6,300 $ 59,400
Percentage of prior year development 0.10% 6.50% 0.90% 8.80%
Underwriting segments | Other        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 1,100 $ 100 $ 1,300 $ 100