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RESERVE FOR LOSSES AND LOSS EXPENSES (Tables)
 9 Months Ended
Sep. 30, 2022
Insurance [Abstract]  
RECONCILIATION OF BEGINNING AND ENDING GROSS RESERVE FOR LOSSES AND LOSS EXPENSES AND NET RESERVE FOR UNPAID LOSSES AND LOSS EXPENSES
The following table presents a reconciliation of the Company's beginning and ending gross reserve for losses and loss expenses and net reserve for unpaid losses and loss expenses:
Nine months ended September 30,
20222021
Gross reserve for losses and loss expenses, beginning of period$14,653,094 $13,926,766 
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period(5,017,611)(4,496,641)
Net reserve for unpaid losses and loss expenses, beginning of period9,635,483 9,430,125 
Net incurred losses and loss expenses related to:
Current year2,461,828 2,315,697 
Prior years(17,632)(23,138)
 2,444,196 2,292,559 
Net paid losses and loss expenses related to:
Current year(269,466)(263,969)
Prior years(1,900,366)(1,778,479)
 (2,169,832)(2,042,448)
Foreign exchange and other(501,914)(10,885)
Net reserve for unpaid losses and loss expenses, end of period9,407,933 9,669,351 
Reinsurance recoverable on unpaid losses and loss expenses, end of period5,244,263 4,989,645 
Gross reserve for losses and loss expenses, end of period$14,652,196 $14,658,996 
NET PRIOR YEAR RESERVE DEVELOPMENT BY SEGMENT
The Company's net favorable prior year reserve development arises from changes to estimates of losses and loss expenses related to loss events that occurred in previous calendar years. The following table presents net prior year reserve development by segment:
  Three months ended September 30,Nine months ended September 30,
  2022202120222021
Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)
Insurance$2,558 $5,418 $12,396 $13,351 
Reinsurance2,177 5,594 5,236 9,787 
Total$4,735 $11,012 $17,632 $23,138 
SCHEDULE OF THE LINE OF BUSINESS CATEGORIES AND THE EXPECTED CLAIM TAILS
The following table maps lines of business to reserve classes and the expected claim tails:
Insurance segment
Reserve class and tail
Property and otherMarineAviationCredit and political riskProfessional linesLiability
ShortShortShort/MediumMediumMediumLong
Reported lines of business
PropertyX
MarineX
TerrorismX
AviationX
Credit and political riskX
Professional linesX
LiabilityX
Accident and healthX
The following table maps lines of business to reserve classes and the expected claim tails:
Reinsurance segment
Reserve class and tail
Property and otherCredit and suretyProfessional linesMotorLiability
ShortMediumMediumLongLong
Reported lines of business
CatastropheX
PropertyX
Credit and suretyX
Professional linesX
MotorX
LiabilityX
EngineeringX
AgricultureX
Marine and aviationX
Accident and healthX
NET INCURRED AND PAID CLAIMS DEVELOPMENT TABLES BY ACCIDENT YEAR
Prior year reserve development by reserve class was as follows:
  Three months ended September 30,Nine months ended September 30,
  2022202120222021
Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)
Property and other$5,211 $12,486 $18,290 $63,167 
Marine17,346 4,189 30,239 23,411 
Aviation3,203 3,958 7,888 9,802 
Credit and political risk8,106 7,610 13,288 6,294 
Professional lines(2,747)(20,759)(3,937)(68,405)
Liability(28,561)(2,066)(53,372)(20,918)
Total$2,558 $5,418 $12,396 $13,351 
Prior year reserve development by reserve class was as follows:
  Three months ended September 30,Nine months ended September 30,
  2022202120222021
Favorable
(Adverse)		Favorable
(Adverse)		Favorable
(Adverse)		Favorable
(Adverse)
Property and other$12,794 $(5,486)$44,127 $7,792 
Credit and surety5,905 8,623 16,952 (1,231)
Professional lines(11,431)(3,244)(41,954)(14,048)
Motor6,849 8,345 8,979 38,431 
Liability(11,940)(2,645)(22,868)$(21,157)
Total$2,177 $5,594 $5,236 $9,787