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Segment Information (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Schedule of Revenue from Continuing Operations By Segment

Revenue by Segment
Years ended December 31,
($ in thousands)		2016				2015			2014
Standard Commercial Lines:
Net premiums earned:
Commercial automobile		$	398,942			358,909			333,310
Workers compensation		308,233				290,075			274,585
General liability		527,859				483,291			444,938
Commercial property		293,438				269,022			244,792
Businessowners’ policies		97,754				93,428			85,788
Bonds		23,227				20,350			19,288
Other		16,030				14,367			13,011
Miscellaneous income		7,782				6,343			14,747
Total Standard Commercial Lines revenue		1,673,265				1,535,785			1,430,459
Standard Personal Lines:
Net premiums earned:
Personal automobile		142,876				146,784			151,317
Homeowners		130,973				134,382			134,273
Other		6,758				6,968			11,157
Miscellaneous income		1,098				1,113			1,834
Total Standard Personal Lines revenue		281,705				289,247			298,581
E&S Lines:
Net premiums earned:
Commercial liability		151,638				126,064			99,086
Commercial property		51,844				46,269			41,064
Miscellaneous income		1				—			17
Total E&S Lines revenue		203,483				172,333			140,167
Investments:
Net investment income		130,754				121,316			138,708
Net realized investment (losses) gains		(4,937		)		13,171			26,599
Total investment revenues		125,817				134,487			165,307
Total all segments		2,284,270				2,131,852			2,034,514
Other income		—				—			347
Total revenues		$	2,284,270			2,131,852			2,034,861

Schedule of Income from Continuing Operations before Federal Income Tax

Income before Federal Income Tax
Years ended December 31,
($ in thousands)		2016				2015			2014
Standard Commercial Lines:
Underwriting gain, before federal income tax		$	146,435			164,496			61,221
GAAP combined ratio		91.2		%		89.2	%		95.7	%
Statutory combined ratio		89.9		%		89.2	%		95.5	%
Standard Personal Lines:
Underwriting gain, before federal income tax		12,419				1,336			16,536
GAAP combined ratio		95.6		%		99.5	%		94.4	%
Statutory combined ratio		95.2		%		99.9	%		94.5	%
E&S Lines:
Underwriting (loss) gain, before federal income tax		(6,921		)		(16,803	)		386
GAAP combined ratio		103.4		%		109.8	%		99.7	%
Statutory combined ratio		102.1		%		108.4	%		99.2	%
Investments:
Net investment income		$	130,754			121,316			138,708
Net realized investment (losses) gains		(4,937		)		13,171			26,599
Total investment income, before federal income tax		125,817				134,487			165,307
Tax on investment income		30,621				32,090			43,811
Total investment income, after federal income tax		$	95,196			102,397			121,496

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)		2016				2015			2014
Underwriting gain (loss), before federal income tax
Standard Commercial Lines		$	146,435			164,496			61,221
Standard Personal Lines		12,419				1,336			16,536
E&S Lines		(6,921		)		(16,803	)		386
Investment income, before federal income tax		125,817				134,487			165,307
Total all segments		277,750				283,516			243,450
Interest expense		(22,771		)		(22,428	)		(23,063	)
General corporate and other expenses		(35,024		)		(28,396	)		(23,256	)
Income, before federal income tax		$	219,955			232,692			197,131

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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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
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

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-Name Accounting Standards Codification
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