Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2020, $16,392,238 ; 2019, $16,473,491 , credit allowances: 2020, $25,837 ; 2019, $0 )	$ 17,055,259	$ 16,824,944
Fixed maturities - available for sale, at fair value	4,431	5,826
Equity securities, at fair value	949,170	931,457
Short-term investments (cost: 2020, $854,248 ; 2019, $414,639 )	853,964	414,706
Other invested assets (cost: 2020, $1,816,373 ; 2019, $1,763,531 )	1,816,373	1,763,531
Cash	922,479	808,036
Total investments and cash	21,601,676	20,748,500
Accrued investment income	120,387	116,804
Premiums receivable	2,484,271	2,259,088
Reinsurance receivables	1,852,887	1,763,471
Funds held by reinsureds	513,123	489,901
Deferred acquisition costs	578,210	581,863
Prepaid reinsurance premiums	464,206	445,716
Income taxes	294,333	305,711
Other assets	675,700	612,997
TOTAL ASSETS	28,584,793	27,324,051
LIABILITIES:
Reserve for losses and loss adjustment expenses	14,276,641	13,611,313
Future policy benefit reserve	40,659	42,592
Unearned premium reserve	3,190,174	3,056,735
Funds held under reinsurance treaties	11,876	10,668
Other net payable to reinsurers	369,761	291,660
Losses in course of payment	199,157	51,950
Senior notes due 6/1/2044	397,134	397,074
Long term notes due 5/1/2067	223,625	236,758
Accrued interest on debt and borrowings	2,368	2,878
Equity index put option liability	9,088	5,584
Unsettled securities payable	89,749	30,650
Other liabilities	488,262	453,264
Total liabilities	19,298,494	18,191,126
Commitments and contingencies (Note 9)
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) 69,608 and (2019) 69,464 outstanding before treasury shares	696	694
Additional paid-in capital	2,225,993	2,219,660
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $66,616 at 2020 and $30,996 at 2019	297,137	28,152
Treasury shares, at cost; 29,636 shares (2020) and 28,665 shares (2019)	(3,622,172)	(3,422,152)
Retained earnings	10,384,645	10,306,571
Total shareholders' equity	9,286,299	9,132,925
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 28,584,793	$ 27,324,051