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Reserve for Loss and Loss Expense (Tables)
3 Months Ended
Mar. 31, 2019
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
 
 
Quarter ended March 31,
($ 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
 
397,253

 
388,801

Prior years
 
(10,674
)
 
(3,860
)
Total incurred loss and loss expense
 
386,579

 
384,941

Paid loss and loss expense for claims occurring in the:
 
 

 
 

Current year
 
73,964

 
79,345

Prior years
 
246,168

 
248,738

Total paid loss and loss expense
 
320,132

 
328,083

Net reserve for loss and loss expense, at end of period
 
3,422,927

 
3,242,243

Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period
 
543,582

 
549,837

Gross reserve for loss and loss expense at end of period
 
$
3,966,509

 
3,792,080