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Segment Information (Revenue From Continuing Operations by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]      
Net premiums earned $ 3,373,380 $ 3,017,253 $ 2,681,814
Other income 11,335 17,723 17,570
Net investment income earned 288,155 326,589 227,107
Net realized and unrealized investment (losses) gains (114,808) 17,599 (4,217)
Total investment revenues 173,347 344,188 222,890
Total revenues 3,558,062 3,379,164 2,922,274
Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Other income 9,519 16,056 15,512
Total revenues 2,749,338 2,459,941 2,158,696
Standard Personal Lines      
Revenue from External Customer [Line Items]      
Other income 1,816 1,667 2,058
Total revenues 301,221 295,226 301,198
E&S Lines [Member]      
Revenue from External Customer [Line Items]      
Total revenues 334,156 279,809 239,490
Commercial Automobile [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 495,647 436,412 388,120
Workers Compensation [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 335,955 306,428 278,062
General Liability [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 902,428 807,158 694,019
Commercial Property [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 812,306 724,398 615,181
Business Owners' Policies [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 124,474 110,622 110,210
Bonds Segment [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 43,354 35,762 36,742
Other Commercial [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 25,655 23,105 20,850
Personal Automobile [Member] | Standard Personal Lines      
Revenue from External Customer [Line Items]      
Net premiums earned 162,899 163,007 165,020
Homeowners [Member] | Standard Personal Lines      
Revenue from External Customer [Line Items]      
Net premiums earned 128,222 122,526 125,405
Other Personal [Member] | Standard Personal Lines      
Revenue from External Customer [Line Items]      
Net premiums earned 8,284 8,026 8,715
Casualty Insurance Product Line [Member] | E&S Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 233,086 197,779 174,408
Property Insurance [Member] | E&S Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned $ 101,070 $ 82,030 $ 65,082