Securities In An Unrealized Loss Position (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Securities In An Unrealized Loss Position

The following tables summarize all securities in an unrealized loss position at December 31, 2017 and 2016 by the length of time those securities have been continuously in an unrealized loss position.

	Less Than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
December 31, 2017
U.S. government and government agency	$	92,167	$	1,491	$	72,055	$	2,341	$	164,222	$	3,832
State and municipal	735,972		5,944		345,755		6,630		1,081,727		12,574
Mortgage-backed securities	480,435		5,110		373,956		11,065		854,391		16,175
Asset-backed securities	1,127,309		8,298		167,412		2,314		1,294,721		10,612
Corporate	1,103,747		8,224		170,858		5,946		1,274,605		14,170
Foreign government	244,139		2,615		25,824		251		269,963		2,866
Fixed maturity securities	3,783,769		31,682		1,155,860		28,547		4,939,629		60,229
Common stocks	9,244		1,211		9,387		749		18,631		1,960
Preferred stocks	—		—		23,077		2,597		23,077		2,597
Equity securities available for sale	9,244		1,211		32,464		3,346		41,708		4,557
Total	$	3,793,013	$	32,893	$	1,188,324	$	31,893	$	4,981,337	$	64,786
December 31, 2016
U.S. government and government agency	$	112,709	$	1,252	$	35,450	$	1,341	$	148,159	$	2,593
State and municipal	1,562,614		35,553		133,034		4,885		1,695,648		40,438
Mortgage-backed securities	625,903		11,103		109,066		4,828		734,969		15,931
Asset-backed securities	1,010,836		5,340		201,693		6,601		1,212,529		11,941
Corporate	1,035,245		13,448		65,147		7,470		1,100,392		20,918
Foreign government	213,246		1,985		24,820		777		238,066		2,762
Fixed maturity securities	4,560,553		68,681		569,210		25,902		5,129,763		94,583
Common stocks	336		22		8,755		1,024		9,091		1,046
Preferred stocks	—		—		22,034		3,639		22,034		3,639
Equity securities available for sale	336		22		30,789		4,663		31,125		4,685
Total	$	4,560,889	$	68,703	$	599,999	$	30,565	$	5,160,888	$	99,268

Non-Investment Grade Fixed Maturity Securities

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 2017 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	11	$	96,741	$	1,197
Corporate	7	54,590		2,725
Mortgage-backed securities	6	5,368		138
State and municipal	1	3,662		1
Asset-backed securities	3	441		116
Total	28	$	160,802	$	4,177