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Reserve for Loss and Loss Expense (Tables)
9 Months Ended
Sep. 30, 2018
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
 
 
Nine Months ended September 30,
($ in thousands)
 
2018
 
2017
Gross reserve for loss and loss expense, at beginning of year
 
$
3,771,240

 
3,691,719

Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year
 
585,855

 
611,200

Net reserve for loss and loss expense, at beginning of year
 
3,185,385

 
3,080,519

Incurred loss and loss expense for claims occurring in the:
 
 

 
 

Current year
 
1,148,032

 
1,037,079

Prior years
 
(17,564
)
 
(33,461
)
Total incurred loss and loss expense
 
1,130,468

 
1,003,618

Paid loss and loss expense for claims occurring in the:
 
 

 
 

Current year
 
369,036

 
314,686

Prior years
 
610,734

 
581,186

Total paid loss and loss expense
 
979,770

 
895,872

Net reserve for loss and loss expense, at end of period
 
3,336,083

 
3,188,265

Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period
 
589,072

 
647,535

Gross reserve for loss and loss expense at end of period
 
$
3,925,155

 
3,835,800