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Variable Interest Entity and Noncontrolling Interests - Carrying amount of assets and liabilities of variable interest entity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets        
Investments accounted for using the fair value option $ 1,973,550 $ 3,824,796    
Fixed maturities available for sale, at fair value 17,998,109 18,717,825    
Equity securities, at fair value 1,804,170 1,444,830    
Cash 858,668 906,448 $ 726,230  
Accrued investment income 85,453 103,299    
Premiums receivable 2,633,280 2,064,586 1,778,717  
Ceded unearned premiums 1,729,455 1,234,075    
Deferred acquisition costs 901,841 790,708    
Receivable for securities sold 60,179 92,743    
Goodwill and intangible assets 944,983 692,863 738,083  
Other assets 2,453,849 1,724,288    
Total assets of consolidated VIE 45,100,945 43,282,297 37,885,361  
Liabilities        
Reserve for losses and loss adjustment expenses 17,757,156 16,513,929 13,891,842 $ 11,853,297
Unearned premiums 6,011,942 4,838,965    
Reinsurance balances payable 1,583,253 683,263    
Revolving credit agreement borrowings 0 155,687    
Senior notes 2,724,394 2,861,113    
Payable for securities purchased 64,850 218,779    
Other liabilities 1,329,742 1,510,888    
Total liabilities of consolidated VIE $ 31,545,816 29,294,856 $ 25,569,809  
Somers Holdings Ltd. | Variable Interest Entity, Primary Beneficiary        
Assets        
Investments accounted for using the fair value option [1]   1,790,385    
Fixed maturities available for sale, at fair value   655,249    
Equity securities, at fair value   52,410    
Cash   211,451    
Accrued investment income   14,679    
Premiums receivable   224,377    
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses   286,590    
Ceded unearned premiums   122,339    
Deferred acquisition costs   53,705    
Receivable for securities sold   37,423    
Goodwill and intangible assets   7,650    
Other assets   75,801    
Total assets of consolidated VIE   3,532,059    
Liabilities        
Reserve for losses and loss adjustment expenses   1,519,583    
Unearned premiums   407,714    
Reinsurance balances payable   63,269    
Revolving credit agreement borrowings   155,687    
Senior notes   172,689    
Payable for securities purchased   25,881    
Other liabilities   193,494    
Total liabilities of consolidated VIE   2,538,317    
Redeemable noncontrolling interests   $ 52,398    
[1] Included in “other investments” on the Company’s balance sheet