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Reserve for Loss and Loss Expense (Tables)
6 Months Ended
Jun. 30, 2019
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
 
 
Six Months ended June 30,
($ in thousands)
 
2019
 
2018
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

Prior years
 
(16,375
)
 
(5,586
)
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

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