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Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
REVENUES:      
Premiums earned $ 8,681,513 $ 7,403,686 $ 6,931,699
Net Investment Income 642,465 647,139 581,183
Net realized capital gains (losses):      
Credit allowances on fixed maturity securities (1,745)
Other-than-temporary impairments on fixed maturity securities (20,899) (8,110)
Other net realized capital gains (losses) 269,394 205,903 (119,026)
Total net realized capital gains (losses) 267,649 185,004 (127,136)
Other income (expense) 6,487 (4,660) (24,251)
Total revenues 9,598,114 8,231,169 7,361,495
CLAIMS AND EXPENSES:      
Incurred losses and loss adjustment expenses 6,550,837 4,922,898 5,651,403
Commission, brokerage, taxes and fees 1,873,250 1,703,726 1,519,030
Other underwriting expenses 511,237 440,899 371,541
Corporate expenses 41,118 32,966 30,672
Interest, fees and bond issue cost amortization expense 36,323 31,693 31,031
Total claims and expenses 9,012,765 7,132,182 7,603,677
INCOME (LOSS) BEFORE TAXES 585,349 1,098,987 (242,182)
Income tax expense (benefit) 71,198 89,526 (331,223)
NET INCOME (LOSS) 514,151 1,009,461 89,041
Other comprehensive income (loss), net of tax:      
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period 423,210 496,430 (255,656)
Reclassification adjustment for realized losses (gains) included in net income (loss) (3,476) (12,613) 27,496
Total URA(D) on securities arising during the period 419,734 483,817 (228,160)
Foreign currency translation adjustments 86,327 14,030 (76,816)
Benefit plan actuarial net gain (loss) for the period (5,615) (12,591) (510)
Reclassification adjustment for amortization of net (gain) loss included in net income (loss) 6,300 5,453 5,021
Total benefit plan net gain (loss) for the period 685 (7,138) 4,511
Total other comprehensive income (loss), net of tax 506,746 490,709 (300,465)
COMPREHENSIVE INCOME (LOSS) $ 1,020,897 $ 1,500,170 $ (211,424)
EARNINGS PER COMMON SHARE:      
Basic $ 12.81 $ 24.77 $ 2.18
Diluted $ 12.78 $ 24.70 $ 2.17