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Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule of Revenue from Continuing Operations By Segment

Revenue by Segment		Years ended December 31,
($ in thousands)		2017				2016			2015
Standard Commercial Lines:
Net premiums earned:
Commercial automobile		$	442,818			398,942			358,909
Workers compensation		317,982				308,233			290,075
General liability		569,217				527,859			483,291
Commercial property		311,932				293,438			269,022
Businessowners’ policies		100,266				97,754			93,428
Bonds		29,086				23,227			20,350
Other		17,198				16,030			14,367
Miscellaneous income		9,488				7,782			6,343
Total Standard Commercial Lines revenue		1,797,987				1,673,265			1,535,785
Standard Personal Lines:
Net premiums earned:
Personal automobile		153,147				142,876			146,784
Homeowners		129,699				130,973			134,382
Other		6,855				6,758			6,968
Miscellaneous income		1,228				1,098			1,113
Total Standard Personal Lines revenue		290,929				281,705			289,247
E&S Lines:
Net premiums earned:
Casualty lines		157,366				151,638			126,064
Property lines		55,461				51,844			46,269
Miscellaneous income		—				1			—
Total E&S Lines revenue		212,827				203,483			172,333
Investments:
Net investment income		161,882				130,754			121,316
Net realized investment gains (losses)		6,359				(4,937	)		13,171
Total Investments revenues		168,241				125,817			134,487
Total revenues		$	2,469,984			2,284,270			2,131,852

Schedule of Income from Continuing Operations before Federal Income Tax

Income Before Federal Income Tax		Years ended December 31,
($ in thousands)		2017				2016			2015
Standard Commercial Lines:
Underwriting gain, before federal income tax		$	149,514			146,435			164,496
Underwriting gain, after federal income tax		97,184				95,183			106,923
Combined ratio		91.6		%		91.2	%		89.2	%
Standard Personal Lines:
Underwriting gain, before federal income tax		11,104				12,419			1,336
Underwriting gain, after federal income tax		7,217				8,072			868
Combined ratio		96.2		%		95.6	%		99.5	%
E&S Lines:
Underwriting loss, before federal income tax		(6,282		)		(6,921	)		(16,803	)
Underwriting loss, after federal income tax		(4,083		)		(4,499	)		(10,922	)
Combined ratio		103.0		%		103.4	%		109.8	%
Investments:
Net investment income		$	161,882			130,754			121,316
Net realized investment gains (losses)		6,359				(4,937	)		13,171
Total investment income, before federal income tax		168,241				125,817			134,487
Tax on investment income		45,588				30,621			32,090
Total investment income, after federal income tax		$	122,653			95,196			102,397

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)		2017				2016			2015
Underwriting gain (loss)
Standard Commercial Lines		$	149,514			146,435			164,496
Standard Personal Lines		11,104				12,419			1,336
E&S Lines		(6,282		)		(6,921	)		(16,803	)
Investment income		168,241				125,817			134,487
Total all segments		322,577				277,750			283,516
Interest expense		(24,354		)		(22,771	)		(22,428	)
Corporate expenses		(36,255		)		(35,024	)		(28,396	)
Income, before federal income tax		$	261,968			219,955			232,692

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599

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- Definition

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.

+ References

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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

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