Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
REVENUES:
Premiums earned	$ 2,791,765	$ 2,387,865
Net investment income	242,830	260,413
Net gains (losses) on investments:
Credit allowances on fixed maturity securities	(11,853)	(6,977)
Gains (loss) from fair value adjustments	(136,860)	29,056
Net realized gains (losses) from dispositions	(4,914)	16,823
Total net gains (losses) on investments	(153,627)	38,902
Other income (expense)	15,363	56,593
Total revenues	2,896,331	2,743,773
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	1,789,863	1,711,419
Commission, brokerage, taxes and fees	605,230	489,011
Other underwriting expenses	161,293	142,231
Corporate expenses	14,020	12,378
Interest, fees and bond issue cost amortization expense	24,078	15,639
Total claims and expenses	2,594,484	2,370,678
INCOME (LOSS) BEFORE TAXES	301,847	373,095
Income tax expense (benefit)	4,096	31,233
NET INCOME (LOSS)	297,751	341,862
Other comprehensive income (loss), net of tax:
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	(815,177)	(288,615)
Reclassification adjustment for realized losses (gains) included in net income (loss)	4,178	(3,666)
Total URA(D) on securities arising during the period	(810,999)	(292,281)
Foreign currency translation adjustments	(34,102)	(9,582)
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	758	2,043
Total benefit plan net gain (loss) for the period	758	2,043
Total other comprehensive income (loss), net of tax	(844,343)	(299,820)
COMPREHENSIVE INCOME (LOSS)	$ (546,592)	$ 42,042
EARNINGS PER COMMON SHARE:
Basic	$ 7.57	$ 8.53
Diluted	$ 7.56	$ 8.52