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Fixed Maturity Securities In An Unrealized Loss Position Fixed Maturity Securities In An Unrealized Loss Position (Tables)
 6 Months Ended
Jun. 30, 2018
Statement of Financial Position [Abstract]  
Securities in an unrealized loss position
The following tables summarize all fixed maturity securities in an unrealized loss position at June 30, 2018 and December 31, 2017 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
June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. government and government agency
$
245,718

 
$
2,852

 
$
93,232

 
$
3,411

 
$
338,950

 
$
6,263

State and municipal
1,406,792

 
22,540

 
302,403

 
9,679

 
1,709,195

 
32,219

Mortgage-backed securities
859,133

 
17,171

 
328,074

 
14,699

 
1,187,207

 
31,870

Asset-backed securities
1,538,222

 
12,216

 
160,722

 
868

 
1,698,944

 
13,084

Corporate
2,171,776

 
61,233

 
155,159

 
8,988

 
2,326,935

 
70,221

Foreign government
181,036

 
4,754

 
67,869

 
1,116

 
248,905

 
5,870

Fixed maturity securities
$
6,402,677

 
$
120,766

 
$
1,107,459

 
$
38,761

 
$
7,510,136

 
$
159,527

 
 
 
 
 
 
 
 
 
 
 
 
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
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 June 30, 2018 is presented in the table below:
($ in thousands)
Number of
Securities
 
Aggregate
Fair Value
 
Gross
Unrealized Loss
Corporate
13

 
$
97,985

 
$
4,199

Foreign government
12

 
51,383

 
2,773

Asset-backed securities
3

 
268

 
104

Mortgage-backed securities
4

 
3,477

 
28

State and municipal
1

 
3,622

 
2

Total
33

 
$
156,735

 
$
7,106