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Reserve for Loss and Loss Expense (Tables)
6 Months Ended
Jun. 30, 2020
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
 
 
Six Months ended June 30,
($ 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
 
825,201

 
783,938

Prior years
 
(20,928
)
 
(16,375
)
Total incurred loss and loss expense
 
804,273

 
767,563

Paid loss and loss expense for claims occurring in the:
 
 

 
 

Current year
 
221,422

 
210,374

Prior years
 
479,736

 
442,820

Total paid loss and loss expense
 
701,158

 
653,194

Net reserve for loss and loss expense, at end of period
 
3,623,212

 
3,470,849

Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period
 
553,694

 
556,203

Gross reserve for loss and loss expense at end of period
 
$
4,176,906

 
4,027,052


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.