Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2020, $17,131,414 ; 2019, $16,473,491 , credit allowances: 2020, $19,641 ; 2019, $0 )	$ 17,856,377	$ 16,824,944
Fixed maturities - available for sale, at fair value	3,748	5,826
Equity securities, at fair value	1,173,162	931,457
Short-term investments (cost: 2020, $1,221,198 ; 2019, $414,639 )	1,220,753	414,706
Other invested assets (cost: 2020, $1,911,757 ; 2019, $1,763,531 )	1,911,757	1,763,531
Cash	938,881	808,036
Total investments and cash	23,104,678	20,748,500
Accrued investment income	132,513	116,804
Premiums receivable	2,611,036	2,259,088
Reinsurance receivables	1,923,012	1,763,471
Funds held by reinsureds	548,940	489,901
Deferred acquisition costs	601,784	581,863
Prepaid reinsurance premiums	455,961	445,716
Income taxes	77,761	305,711
Other assets	697,342	612,997
TOTAL ASSETS	30,153,027	27,324,051
LIABILITIES:
Reserve for losses and loss adjustment expenses	15,233,125	13,611,313
Future policy benefit reserve	40,374	42,592
Unearned premium reserve	3,447,455	3,056,735
Funds held under reinsurance treaties	15,931	10,668
Other net payable to reinsurers	364,654	291,660
Losses in course of payment	184,894	51,950
Senior notes due 6/1/2044	397,164	397,074
Long term notes due 5/1/2067	223,649	236,758
Advances from FHLB	90,000
Accrued interest on debt and borrowings	7,215	2,878
Equity index put option liability	6,632	5,584
Unsettled securities payable	119,869	30,650
Other liabilities	430,773	453,264
Total liabilities	20,561,735	18,191,126
Commitments and contingencies (Note 8)
SHAREHOLDERS' EQUITY:
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued and outstanding
Common shares, par value: $0.01; 200,000 shares authorized; (2020) 69,603 and (2019) 69,464 outstanding before treasury shares	696	694
Additional paid-in capital	2,235,378	2,219,660
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $74,481 at 2020 and $30,996 at 2019	411,598	28,152
Treasury shares, at cost; 29,636 shares (2020) and 28,665 shares (2019)	(3,622,172)	(3,422,152)
Retained earnings	10,565,792	10,306,571
Total shareholders' equity	9,591,292	9,132,925
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 30,153,027	$ 27,324,051