Consolidated Statements Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES:
Net premiums written	$ 1,739,818	$ 1,743,464	$ 3,585,664	$ 3,453,065
Change in net unearned premiums	(62,903)	(96,623)	(217,331)	(213,368)
Net premiums earned	1,676,915	1,646,841	3,368,333	3,239,697
Net investment income	85,431	188,333	260,194	346,587
Net realized and unrealized gains (losses) on investments	61,653	73,574	(81,632)	142,226
Change in allowance for expected credit losses on investments	16,232	0	(17,657)	0
Net investment gains (losses)	77,885	73,574	(99,289)	142,226
Revenues from non-insurance businesses	75,742	89,297	169,471	181,124
Insurance service fees	19,870	22,446	45,621	47,759
Other income	183	2,893	2,305	3,013
Total revenues	1,936,026	2,023,384	3,746,635	3,960,406
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,135,126	1,028,830	2,242,379	2,017,479
Other operating costs and expenses	580,840	591,828	1,159,173	1,179,916
Expenses from non-insurance businesses	76,238	88,272	170,996	178,397
Interest expense	38,373	40,718	75,105	81,439
Total operating costs and expenses	1,830,577	1,749,648	3,647,653	3,457,231
Income before income taxes	105,449	273,736	98,982	503,175
Income tax expense	(33,793)	(56,309)	(30,852)	(104,134)
Net income before noncontrolling interests	71,656	217,427	68,130	399,041
Noncontrolling interests	(396)	(718)	(1,288)	(1,610)
Net income to common stockholders	$ 71,260	$ 216,709	$ 66,842	$ 397,431
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 0.38	$ 1.14	$ 0.36	$ 2.09
Diluted (in dollar per share)	$ 0.38	$ 1.12	$ 0.35	$ 2.06