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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]    
Gross reserve for loss and loss expense, at beginning of year $ 3,893,868 $ 3,771,240
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year 537,388 585,855
Net reserve for loss and loss expense, at beginning of year 3,356,480 3,185,385
Incurred loss and loss expense for claims occurring in the current year 1,200,878 1,148,032
Total incurred loss and loss expense 1,166,238 1,130,468
Paid loss and loss expense for claims occurring in the current year 384,436 369,036
Paid loss and loss expense for claims occurring in the prior years 631,589 610,734
Total paid loss and loss expense 1,016,025 979,770
Net reserve for loss and loss expense, at end of period 3,506,693 3,336,083
Add: reinsurance recoverable on unpaid loss and loss expense, at end of period 548,938 589,072
Gross reserve for loss and loss expense, at end of period 4,055,631 3,925,155
Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (34,640) (17,564)
Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (41,000) (24,000)
Property Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development 6,400 6,400
Workers Compensation [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (33,000) (53,000)
General Liability [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (10,000) (8,000)
Personal Automobile [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development $ 2,000  
Commercial Automobile [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   25,000
Excess And Surplus Operations [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   $ 12,000