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Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Revenue from Continuing Operations By Segment



Revenue by Segment
Years ended December 31,
($ in thousands)		2015				2014			2013
Standard Commercial Lines:
Net premiums earned:
Commercial automobile		$	358,909			333,310			310,994
Workers compensation		290,075				274,585			267,612
General liability		483,291				444,938			405,322
Commercial property		269,022				244,792			224,412
Businessowners’ policies		93,428				85,788			77,097
Bonds		20,350				19,288			19,000
Other		14,367				13,011			12,182
Miscellaneous income		6,343				14,747			10,253
Total Standard Commercial Lines revenue		1,535,785				1,430,459			1,326,872
Standard Personal Lines:
Net premiums earned:
Personal automobile		146,784				151,317			152,005
Homeowners		134,382				134,273			127,991
Other		6,968				11,157			14,336
Miscellaneous income		1,113				1,834			1,948
Total Standard Personal Lines revenue		289,247				298,581			296,280
E&S Lines:
Net premiums earned:
General liability		121,802				96,142			88,761
Commercial property		42,736				38,572			32,054
Commercial automobile		7,795				5,436			4,306
Miscellaneous income		—				17			—
Total E&S Lines revenue		172,333				140,167			125,121
Investments:
Net investment income		121,316				138,708			134,643
Net realized investment gains		13,171				26,599			20,732
Total investment revenues		134,487				165,307			155,375
Total all segments		2,131,852				2,034,514			1,903,648
Other income		—				347			93
Total revenues		$	2,131,852			2,034,861			1,903,741

Schedule of Income from Continuing Operations before Federal Income Tax



Income from Continuing Operations before Federal Income Tax
Years ended December 31,
($ in thousands)		2015				2014			2013
Standard Commercial Lines:
Underwriting gain, before federal income tax		$	164,496			61,221			33,856
GAAP combined ratio		89.2		%		95.7	%		97.4	%
Statutory combined ratio		89.2		%		95.5	%		97.1	%

Standard Personal Lines:
Underwriting gain, before federal income tax		1,336				16,536			8,645
GAAP combined ratio		99.5		%		94.4	%		97.1	%
Statutory combined ratio		99.9		%		94.5	%		96.9	%

E&S Lines:
Underwriting (loss) gain, before federal income tax		(16,803		)		386			(3,735	)
GAAP combined ratio		109.8		%		99.7	%		103.0	%
Statutory combined ratio		108.4		%		99.2	%		102.9	%

Investments:
Net investment income		$	121,316			138,708			134,643
Net realized investment gains		13,171				26,599			20,732
Total investment income, before federal income tax		134,487				165,307			155,375
Tax on investment income		32,090				43,811			40,489
Total investment income, after federal income tax		$	102,397			121,496			114,886

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



Reconciliation of Segment Results to Income from Continuing Operations, before Federal Income Tax
Years ended December 31,
($ in thousands)		2015				2014			2013
Underwriting gain (loss), before federal income tax
Standard Commercial Lines		$	164,496			61,221			33,856
Standard Personal Lines		1,336				16,536			8,645
E&S Lines		(16,803		)		386			(3,735	)
Investment income, before federal income tax		134,487				165,307			155,375
Total all segments		283,516				243,450			194,141
Interest expense		(22,428		)		(23,063	)		(26,361	)
General corporate and other expenses		(28,396		)		(23,256	)		(23,978	)
Income from continuing operations, before federal income tax		$	232,692			197,131			143,802