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Reserve for Claims and Claim Expenses (Tables)
6 Months Ended
Jun. 30, 2020
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claim Expenses
The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR:
At June 30, 2020Case
Reserves
Additional
Case Reserves
IBNRTotal
Property$1,095,511  $1,650,244  $842,395  $3,588,150  
Casualty and Specialty1,682,299  127,588  3,967,100  5,776,987  
Other332  —  —  332  
Total
$2,778,142  $1,777,832  $4,809,495  $9,365,469  
At December 31, 2019
Property$1,253,406  $1,631,223  $1,189,221  $4,073,850  
Casualty and Specialty1,596,426  129,720  3,583,913  5,310,059  
Other440  —  —  440  
Total
$2,850,272  $1,760,943  $4,773,134  $9,384,349  
Activity in the liability for unpaid claims and claim expenses is summarized as follows:
Six months ended June 30,20202019
Net reserves as of beginning of period$6,593,052  $3,704,050  
Net incurred related to:
Current year1,082,732  684,481  
Prior years(1,506) (4,073) 
Total net incurred1,081,226  680,408  
Net paid related to:
Current year61,625  52,332  
Prior years1,007,916  570,561  
Total net paid1,069,541  622,893  
Foreign exchange (1)(13,626) (642) 
Amounts acquired (2)—  1,858,775  
Net reserves as of end of period6,591,111  5,619,698  
Reinsurance recoverable as of end of period2,774,358  2,865,150  
Gross reserves as of end of period$9,365,469  $8,484,848  
(1) Reflects the impact of the foreign exchange revaluation of net reserves denominated in non-U.S. dollars as at the balance sheet date.
(2) Represents the fair value of TMR's reserves for claims and claim expenses, net of reinsurance recoverables, acquired at March 22, 2019.
The following table details the Company’s prior year development by segment of its liability for unpaid claims and claim expenses:
Six months ended June 30,20202019
(Favorable) adverse development(Favorable) adverse development
Property$7,444  $12,640  
Casualty and Specialty(8,799) (16,730) 
Other(151) 17  
Total net favorable development of prior accident years net claims and claim expenses
$(1,506) $(4,073) 
The following tables detail the development of the Company’s liability for unpaid claims and claim expenses for its Property segment, allocated between large and small catastrophe net claims and claim expenses and attritional net claims and claim expenses, included in the other line item:
Six months ended June 30,2020
(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2019 Large Loss Events$(19,940) 
2018 Large Loss Events(12,306) 
2017 Large Loss Events(3,825) 
Other7,004  
Total large catastrophe events
(29,067) 
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements
36,511  
Total small catastrophe events and attritional loss movements
36,511  
Total net adverse development of prior accident years net claims and claim expenses
$7,444  
Six months ended June 30,2019
(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2017 Large Loss Events$(56,234) 
2018 Large Loss Events52,132  
Other1,412  
Total large catastrophe events
(2,690) 
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements
9,521  
Total small catastrophe events and attritional loss movements
9,521  
Total catastrophe and attritional net claims and claim expenses
6,831  
Actuarial assumption changes
5,809  
Total net adverse development of prior accident years net claims and claim expenses
$12,640  
The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment:
Six months ended June 30,20202019
(Favorable) adverse development(Favorable) adverse development
Actuarial methods
$(8,799) $(28,850) 
Actuarial assumption changes
—  12,120  
Total net favorable development of prior accident years net claims and claim expenses
$(8,799) $(16,730)