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Reserve for Loss and Loss Expense (Tables)
6 Months Ended
Jun. 30, 2018
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
 
 
Six Months ended June 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
 
756,855

 
684,877

Prior years
 
(5,586
)
 
(25,846
)
Total incurred loss and loss expense
 
751,269

 
659,031

Paid loss and loss expense for claims occurring in the:
 
 

 
 

Current year
 
214,169

 
171,724

Prior years
 
457,441

 
425,521

Total paid loss and loss expense
 
671,610

 
597,245

Net reserve for loss and loss expense, at end of period
 
3,265,044

 
3,142,305

Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period
 
539,321

 
588,916

Gross reserve for loss and loss expense at end of period
 
$
3,804,365

 
3,731,221