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Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Schedule of Revenue from Continuing Operations By Segment

Revenue by Segment						Years ended December 31,
($ in thousands)						2020						2019						2018
Standard Commercial Lines:
Net premiums earned:
Commercial automobile						$	615,181					554,256						493,093
Workers compensation						278,062						311,370						317,616
General liability						694,019						669,895						616,187
Commercial property						388,120						353,834						329,660
Businessowners’ policies						110,210						105,252						103,412
Bonds						36,742						35,726						33,991
Other						20,850						19,281						18,263
Miscellaneous income						15,512						10,889						8,180
Total Standard Commercial Lines revenue						2,158,696						2,060,503						1,920,402
Standard Personal Lines:
Net premiums earned:
Personal automobile						165,020						172,606						168,250
Homeowners						125,405						127,543						128,961
Other						8,715						7,590						7,230
Miscellaneous income						2,058						1,466						1,257
Total Standard Personal Lines revenue						301,198						309,205						305,698
E&S Lines:
Net premiums earned:
Casualty lines						174,408						182,864						164,313
Property lines						65,082						56,954						55,253
Miscellaneous income						—						—						1
Total E&S Lines revenue						239,490						239,818						219,567
Investments:
Net investment income						227,107						222,543						195,336
Net realized and unrealized investment (losses) gains						(4,217)						14,422						(54,923)
Total Investments revenues						222,890						236,965						140,413
Total revenues						$	2,922,274					2,846,491						2,586,080

Schedule of Income from Continuing Operations before and after Federal Income Tax

Income Before and After Federal Income Tax						Years ended December 31,
($ in thousands)						2020						2019						2018
Standard Commercial Lines:
Underwriting gain, before federal income tax						$	151,731					145,990						109,104
Underwriting gain, after federal income tax						119,867						115,332						86,192
Combined ratio						92.9		%				92.9		%				94.3		%
ROE contribution						5.1		%				5.8						4.9
Standard Personal Lines:
Underwriting (loss) gain, before federal income tax						(15,508)						8,260						12,764
Underwriting (loss) gain, after federal income tax						(12,251)						6,525						10,084
Combined ratio						105.2		%				97.3		%				95.8		%
ROE contribution						(0.5)		%				0.3						0.6
E&S Lines:
Underwriting gain (loss), before federal income tax						126						9,743						(695)
Underwriting gain (loss), after federal income tax						100						7,697						(549)
Combined ratio						99.9		%				95.9		%				100.3		%
ROE contribution						—		%				0.4						—
Investments:
Net investment income						$	227,107					222,543						195,336
Net realized and unrealized investment (losses) gains						(4,217)						14,422						(54,923)
Total investment segment income, before federal income tax						222,890						236,965						140,413
Tax on investment segment income						41,609						45,301						19,560
Total investment segment income, after federal income tax						$	181,281					191,664						120,853
ROE contribution of after-tax net investment income						7.8		%				9.6						6.9

Schedule of Reconciliation of Segment Results to Income From Continuing Operations, Before Federal Income Tax

Reconciliation of Segment Results to Income Before Federal Income Tax						Years ended December 31,
($ in thousands)						2020						2019						2018
Underwriting gain (loss)
Standard Commercial Lines						$	151,731					145,990						109,104
Standard Personal Lines						(15,508)						8,260						12,764
E&S Lines						126						9,743						(695)
Investment income						222,890						236,965						140,413
Total all segments						359,239						400,958						261,586
Interest expense						(30,839)						(33,668)						(24,419)
Corporate expenses						(25,412)						(30,900)						(25,446)
Income, before federal income tax						$	302,988					336,390						211,721

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- Definition

Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

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Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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