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Segment Information (Revenue From Continuing Operations by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from External Customer [Line Items]      
Net premiums earned $ 3,017,253 $ 2,681,814 $ 2,597,171
Other income 17,723 17,570 12,355
Net investment income 326,589 227,107 222,543
Net realized and unrealized investment gains (losses) 17,599 (4,217) 14,422
Total investment revenues 344,188 222,890 236,965
Total revenues 3,379,164 2,922,274 2,846,491
Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Other income 16,056 15,512 10,889
Total revenues 2,459,941 2,158,696 2,060,503
Standard Personal Lines      
Revenue from External Customer [Line Items]      
Other income 1,667 2,058 1,466
Total revenues 295,226 301,198 309,205
E&S Lines [Member]      
Revenue from External Customer [Line Items]      
Total revenues 279,809 239,490 239,818
Commercial Automobile [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 436,412 388,120 353,834
Workers Compensation [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 306,428 278,062 311,370
General Liability [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 807,158 694,019 669,895
Commercial Property [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 724,398 615,181 554,256
Business Owners' Policies [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 110,622 110,210 105,252
Bonds Segment [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 35,762 36,742 35,726
Other Commercial [Member] | Standard Commercial Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 23,105 20,850 19,281
Personal Automobile [Member] | Standard Personal Lines      
Revenue from External Customer [Line Items]      
Net premiums earned 163,007 165,020 172,606
Homeowners [Member] | Standard Personal Lines      
Revenue from External Customer [Line Items]      
Net premiums earned 122,526 125,405 127,543
Other Personal [Member] | Standard Personal Lines      
Revenue from External Customer [Line Items]      
Net premiums earned 8,026 8,715 7,590
Casualty Insurance Product Line [Member] | E&S Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned 197,779 174,408 182,864
Property Insurance [Member] | E&S Lines [Member]      
Revenue from External Customer [Line Items]      
Net premiums earned $ 82,030 $ 65,082 $ 56,954