XML 64 R53.htm IDEA: XBRL DOCUMENT v3.10.0.1
RESERVE FOR LOSSES AND LOSS EXPENSES (Prior year development) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Net favorable (adverse) prior year reserve development $ 60,116 $ 70,933 $ 114,423 $ 95,727
Insurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Net favorable (adverse) prior year reserve development 24,294 19,787 47,068 27,652
Reinsurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Net favorable (adverse) prior year reserve development $ 35,822 $ 51,146 $ 67,355 $ 68,075