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Reserve for Loss and Loss Expense (Tables)
3 Months Ended
Mar. 31, 2020
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
 
 
Quarter Ended March 31,
($ in thousands)
 
2020
 
2019
Gross reserve for loss and loss expense, at beginning of year
 
$
4,067,163

 
3,893,868

Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year1
 
547,066

 
537,388

Net reserve for loss and loss expense, at beginning of year
 
3,520,097

 
3,356,480

Incurred loss and loss expense for claims occurring in the:
 
 

 
 

Current year
 
407,276

 
397,253

Prior years
 
(6,952
)
 
(10,674
)
Total incurred loss and loss expense
 
400,324

 
386,579

Paid loss and loss expense for claims occurring in the:
 
 

 
 

Current year
 
70,610

 
73,964

Prior years
 
281,736

 
246,168

Total paid loss and loss expense
 
352,346

 
320,132

Net reserve for loss and loss expense, at end of period
 
3,568,075

 
3,422,927

Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period
 
535,560

 
543,582

Gross reserve for loss and loss expense at end of period
 
$
4,103,635

 
3,966,509

1Includes an adjustment of $2.9 million related to our adoption of ASU 2016-13. Refer to Note 2. "Adoption of Accounting Pronouncements" for additional information.