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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 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 783,938 756,855
Total incurred loss and loss expense 767,563 751,269
Paid loss and loss expense for claims occurring in the current year 210,374 214,169
Paid loss and loss expense for claims occurring in the prior years 442,820 457,441
Total paid loss and loss expense 653,194 671,610
Net reserve for loss and loss expense, at end of period 3,470,849 3,265,044
Add: reinsurance recoverable on unpaid loss and loss expense, at end of period 556,203 539,321
Gross reserve for loss and loss expense, at end of period 4,027,052 3,804,365
Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (16,375) (5,586)
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)
Property Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development 10,600 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 (20,000) (33,000)
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 $ (7,000)  
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   15,000
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   $ 6,000