XML 72 R62.htm IDEA: XBRL DOCUMENT v3.19.2
Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves $ 2,645,625 $ 1,463,713  
Additional Case Reserves 1,764,296 1,425,184  
IBNR 4,074,927 3,187,374  
Gross reserve for claims and claim expenses 8,484,848 6,076,271 $ 4,702,345
Other      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 3,010 1,458  
Additional Case Reserves 0 0  
IBNR 3,166 3,166  
Gross reserve for claims and claim expenses 6,176 4,624  
Property | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,191,810 690,718  
Additional Case Reserves 1,635,595 1,308,307  
IBNR 791,628 1,087,229  
Gross reserve for claims and claim expenses 3,619,033 3,086,254  
Casualty and Specialty | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,450,805 771,537  
Additional Case Reserves 128,701 116,877  
IBNR 3,280,133 2,096,979  
Gross reserve for claims and claim expenses $ 4,859,639 $ 2,985,393