XML 79 R66.htm IDEA: XBRL DOCUMENT v3.21.2
Reserve for Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]        
Minimum period for claims resolution (in years)   5 years    
Net reserves from NORCAL acquisition   $ 1,089,103 $ 0 $ 0
Summary of reserve for losses and loss adjustment expenses        
Balance, beginning of year $ 2,417,179 2,417,179 2,346,526 2,346,526
Less reinsurance recoverables on unpaid losses and loss adjustment expenses 385,087 385,087 390,708 390,708
Net balance, beginning of year 2,032,092 2,032,092 1,955,818 1,955,818
Net reserves acquired from NORCAL acquisition   1,089,103 0 0
Net losses:        
Current year   582,235 555,969 711,846
Favorable development of reserves established in prior years, net   (27,205) (34,557) (50,399)
Total   555,030 521,412 661,447
Paid related to:        
Current year   (62,276) (60,449) (83,204)
Prior years   (457,578) (400,930) (501,969)
Total paid   (519,854) (461,379) (585,173)
Net balance, end of period   3,156,371 2,015,851 2,032,092
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses   476,315 391,637 385,087
Balance, end of period   3,632,686 2,407,488 2,417,179
Retroactive Insurance Contract        
Net losses:        
Current year $ 2,900      
Specialty P&C        
Net losses:        
Current year   5,100 60,000 60,000
Favorable development of reserves established in prior years, net   1,000 $ 9,200 $ 9,200
NORCAL Group        
Net losses:        
Current year   4,300    
NORCAL Group | Specialty P&C        
Net losses:        
Favorable development of reserves established in prior years, net   $ 5,000