Reserve for Loss and Loss Expense (Tables)

6 Months Ended

Jun. 30, 2022

Insurance Loss Reserves [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense

	Six Months ended June 30,
($ in thousands)	2022		2021
Gross reserve for loss and loss expense, at beginning of period	$	4,580,903	4,260,355
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period	578,641		554,269
Net reserve for loss and loss expense, at beginning of period	4,002,262		3,706,086
Incurred loss and loss expense for claims occurring in the:
Current year	1,041,778		886,801
Prior years	(22,674)		(51,777)
Total incurred loss and loss expense	1,019,104		835,024
Paid loss and loss expense for claims occurring in the:
Current year	272,401		227,505
Prior years	570,868		455,919
Total paid loss and loss expense	843,269		683,424
Net reserve for loss and loss expense, at end of period	4,178,097		3,857,686
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period	544,082		579,567
Gross reserve for loss and loss expense at end of period	$	4,722,179	4,437,253