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Reserve for Losses and Loss Expenses Reserves for Losses and Loss Expenses (Tables)
6 Months Ended
Jun. 30, 2017
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
 
 
Six Months ended June 30,
($ in thousands)
 
2017
 
2016
Gross reserves for losses and loss expenses, at beginning of year
 
$
3,691,719

 
3,517,728

Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year
 
611,200

 
551,019

Net reserves for losses and loss expenses, at beginning of year
 
3,080,519

 
2,966,709

Incurred losses and loss expenses for claims occurring in the:
 
 

 
 

Current year
 
684,877

 
624,159

Prior years
 
(25,846
)
 
(28,536
)
Total incurred losses and loss expenses
 
659,031

 
595,623

Paid losses and loss expenses for claims occurring in the:
 
 

 
 

Current year
 
171,724

 
146,849

Prior years
 
425,521

 
402,255

Total paid losses and loss expenses
 
597,245

 
549,104

Net reserves for losses and loss expenses, at end of period
 
3,142,305

 
3,013,228

Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of period
 
588,916

 
576,941

Gross reserves for losses and loss expenses at end of period
 
$
3,731,221

 
3,590,169