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Schedule VI - Supplementary Information Concerning Property-Casualty Insurance Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]      
Deferred policy acquisition costs $ 676,145 $ 556,168 $ 517,364
Reserves for losses and loss expenses 15,390,888 13,784,430 12,583,249
Unearned premiums 4,847,160 4,073,191 3,656,507
Net premiums earned 8,106,031 6,930,843 6,633,288
Net investment income 671,618 583,821 645,614
Losses and loss expenses incurred:      
Current year 4,921,191 4,432,937 4,057,989
Prior years 863 627 34,079
Loss reserve discount accretion 31,906 35,142 39,048
Amortization of deferred policy acquisition costs   904,955 1,001,611
Paid losses and loss expenses 3,665,694 3,598,649 3,659,402
Net premiums written $ 8,862,867 $ 7,262,437 $ 6,863,499