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Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Revenue from Continuing Operations By Segment

Revenue by Segment		Years ended December 31,
($ in thousands)		2018				2017			2016
Standard Commercial Lines:
Net premiums earned:
Commercial automobile		$	493,093			442,818			398,942
Workers compensation		317,616				317,982			308,233
General liability		616,187				569,217			527,859
Commercial property		329,660				311,932			293,438
Businessowners’ policies		103,412				100,266			97,754
Bonds		33,991				29,086			23,227
Other		18,263				17,198			16,030
Miscellaneous income		8,180				9,488			7,782
Total Standard Commercial Lines revenue		1,920,402				1,797,987			1,673,265
Standard Personal Lines:
Net premiums earned:
Personal automobile		168,250				153,147			142,876
Homeowners		128,961				129,699			130,973
Other		7,230				6,855			6,758
Miscellaneous income		1,257				1,228			1,098
Total Standard Personal Lines revenue		305,698				290,929			281,705
E&S Lines:
Net premiums earned:
Casualty lines		164,313				157,366			151,638
Property lines		55,253				55,461			51,844
Miscellaneous income		1				—			1
Total E&S Lines revenue		219,567				212,827			203,483
Investments:
Net investment income		195,336				161,882			130,754
Net realized and unrealized investment (losses) gains		(54,923		)		6,359			(4,937	)
Total Investments revenues		140,413				168,241			125,817
Total revenues		$	2,586,080			2,469,984			2,284,270

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)		2018				2017			2016
Standard Commercial Lines:
Underwriting gain, before federal income tax		$	109,104			149,514			146,435
Underwriting gain, after federal income tax		86,192				97,184			95,183
Combined ratio		94.3		%		91.6	%		91.2	%
ROE contribution		4.9		%		6.1			6.4
Standard Personal Lines:
Underwriting gain, before federal income tax		12,764				11,104			12,419
Underwriting gain, after federal income tax		10,084				7,217			8,072
Combined ratio		95.8		%		96.2	%		95.6	%
ROE contribution		0.6		%		0.4			0.6
E&S Lines:
Underwriting loss, before federal income tax		(695		)		(6,282	)		(6,921	)
Underwriting loss, after federal income tax		(549		)		(4,083	)		(4,499	)
Combined ratio		100.3		%		103.0	%		103.4	%
ROE contribution		—		%		(0.3	)		(0.3	)
Investments:
Net investment income		$	195,336			161,882			130,754
Net realized and unrealized investment (losses) gains		(54,923		)		6,359			(4,937	)
Total investment income, before federal income tax		140,413				168,241			125,817
Tax on investment income		19,560				45,588			30,621
Total investment income, after federal income tax		$	120,853			122,653			95,196
ROE contribution of after-tax net investment income		6.9		%		7.5			6.5

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)		2018				2017			2016
Underwriting gain (loss)
Standard Commercial Lines		$	109,104			149,514			146,435
Standard Personal Lines		12,764				11,104			12,419
E&S Lines		(695		)		(6,282	)		(6,921	)
Investment income		140,413				168,241			125,817
Total all segments		261,586				322,577			277,750
Interest expense		(24,419		)		(24,354	)		(22,771	)
Corporate expenses		(25,446		)		(36,255	)		(35,024	)
Income, before federal income tax		$	211,721			261,968			219,955

X

- 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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