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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 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 397,253 388,801
Total incurred loss and loss expense 386,579 384,941
Paid loss and loss expense for claims occurring in the current year 73,964 79,345
Paid loss and loss expense for claims occurring in the prior years 246,168 248,738
Total paid loss and loss expense 320,132 328,083
Net reserve for loss and loss expense, at end of period 3,422,927 3,242,243
Add: reinsurance recoverable on unpaid loss and loss expense, at end of period 543,582 549,837
Gross reserve for loss and loss expense, at end of period 3,966,509 3,792,080
Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (10,674) (3,860)
Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   (8,000)
Property Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   4,100
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 (8,000) (16,000)
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 $ (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   $ 8,000