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RESERVE FOR LOSSES AND LOSS EXPENSES (Tables)
3 Months Ended
Mar. 31, 2021
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 reserves for unpaid losses and loss expenses:
Three months ended March 31,
20212020
Gross reserve for losses and loss expenses, beginning of period$13,926,766 $12,752,081 
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period(4,496,641)(3,877,756)
Net reserve for unpaid losses and loss expenses, beginning of period9,430,125 8,874,325 
Net incurred losses and loss expenses related to:
Current year720,035 914,186 
Prior years(5,317)(6,113)
 714,718 908,073 
Net paid losses and loss expenses related to:
Current year(26,944)(19,081)
Prior years(666,139)(652,014)
 (693,083)(671,095)
Foreign exchange and other40,282 (130,609)
Net reserve for unpaid losses and loss expenses, end of period9,492,042 8,980,694 
Reinsurance recoverable on unpaid losses and loss expenses, end of period4,533,232 4,101,579 
Gross reserve for losses and loss expenses, end of period$14,025,274 $13,082,273 
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 March 31,
  20212020
Favorable (Adverse)Favorable (Adverse)
Insurance$1,505 $3,832 
Reinsurance3,812 2,281 
Total$5,317 $6,113 
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
Discontinued lines - NovaeXXX
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
Discontinued lines - NovaeXXX
NET INCURRED AND PAID CLAIMS DEVELOPMENT TABLES BY ACCIDENT YEAR
Prior year reserve development by reserve class was as follows:
  Three months ended March 31,
  20212020
Favorable (Adverse)Favorable (Adverse)
Property and other$15,391 $12,491 
Marine11,875 (2,202)
Aviation1,035 3,991 
Credit and political risk(5,371)(916)
Professional lines(14,593)(5,087)
Liability(6,832)(4,445)
Total$1,505 $3,832 
Prior year reserve development by reserve class was as follows:
  Three months ended March 31,
  20212020
Property and other$969 $(3,905)
Credit and surety(4,939)4,854 
Professional lines(2,204)5,162 
Motor17,140 13,085 
Liability(7,154)(16,915)
Total$3,812 $2,281