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Investments (Tables)
9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Fair Values and Gross Unrealized Gains and Losses
 
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
 
Gains
 
Losses
 
As of September 30, 2015
(In Thousands)
U.S. Treasury securities and obligations of U.S. government agencies
$
68,243

 
$
86

 
$
(106
)
 
$
68,223

Municipal debt securities
11,001

 
7

 
(24
)
 
10,984

Corporate debt securities
179,650

 
486

 
(2,793
)
 
177,343

Asset-backed securities
57,745

 
288

 
(128
)
 
57,905

Total investments
$
316,639

 
$
867

 
$
(3,051
)
 
$
314,455

 
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
 
Gains
 
Losses
 
As of December 31, 2014
(In Thousands)
U.S. Treasury securities and obligations of U.S. government agencies
$
68,911

 
$
7

 
$
(573
)
 
$
68,345

Municipal debt securities
12,009

 
27

 
(73
)
 
11,963

Corporate debt securities
200,358

 
883

 
(1,456
)
 
199,785

Asset-backed securities
56,440

 
222

 
(254
)
 
56,408

Total investments
$
337,718

 
$
1,139

 
$
(2,356
)
 
$
336,501

Schedule of Investments by Maturity
The amortized cost and fair values of available for sale securities at September 30, 2015 and December 31, 2014, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Because most asset-backed securities provide for periodic payments throughout their lives, they are listed below in separate categories.
As of September 30, 2015
Amortized
Cost
 
Fair
Value
 
(In Thousands)
Due in one year or less
$
17,951

 
$
17,971

Due after one through five years
149,970

 
150,086

Due after five through ten years
72,232

 
70,149

Due after ten years
18,741

 
18,344

Asset-backed securities
57,745

 
57,905

Total investments
$
316,639

 
$
314,455

As of December 31, 2014
Amortized
Cost
 
Fair
Value
 
(In Thousands)
Due in one year or less
$
6,110

 
$
6,125

Due after one through five years
195,492

 
194,472

Due after five through ten years
54,360

 
53,891

Due after ten years
25,316

 
25,605

Asset-backed securities
56,440

 
56,408

Total investments
$
337,718

 
$
336,501

Schedule of Aging Unrealized Losses
For those securities in an unrealized loss position, the length of time the securities were in such a position is as follows:
 
Less Than 12 Months
 
12 Months or Greater
 
Total
 
# of Securities
Fair Value
Unrealized Losses
 
# of Securities
Fair Value
Unrealized Losses
 
# of Securities
Fair Value
Unrealized Losses
As of September 30, 2015
 
(Dollars in Thousands)
U.S. Treasury securities and obligations of U.S. government agencies
2

$
12,740

$
(57
)
 
4

$
19,990

$
(49
)
 
6

$
32,730

$
(106
)
Municipal debt securities
—

—

—

 
2

4,976

(24
)
 
2

4,976

(24
)
Corporate debt securities
34

96,420

(2,473
)
 
5

13,589

(320
)
 
39

110,009

(2,793
)
Assets-backed securities
5

8,773

(71
)
 
3

9,273

(57
)
 
8

18,046

(128
)
Total investments
41

$
117,933

$
(2,601
)
 
14

$
47,828

$
(450
)
 
55

$
165,761

$
(3,051
)
 
Less Than 12 Months
 
12 Months or Greater
 
Total
 
# of Securities
Fair Value
Unrealized Losses
 
# of Securities
Fair Value
Unrealized Losses
 
# of Securities
Fair Value
Unrealized Losses
As of December 31, 2014
 
(Dollars in Thousands)
U.S. Treasury securities and obligations of U.S. government agencies
4

$
7,228

$
(33
)
 
10

$
49,884

$
(540
)
 
14

$
57,112

$
(573
)
Municipal debt securities
1

3,232

(18
)
 
1

1,695

(55
)
 
2

4,927

(73
)
Corporate debt securities
26

60,334

(559
)
 
22

65,806

(897
)
 
48

126,140

(1,456
)
Assets-backed securities
3

10,614

(57
)
 
4

20,047

(197
)
 
7

30,661

(254
)
Total investments
34

$
81,408

$
(667
)
 
37

$
137,432

$
(1,689
)
 
71

$
218,840

$
(2,356
)
Net Realized Investments Gains (Losses)
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(In Thousands)
Gross realized investment gains
$
266

 
$
566

 
$
1,526

 
$
566

Gross realized investment losses
(281
)
 
(432
)
 
(574
)
 
(432
)
Net realized investment (losses) gains
$
(15
)
 
$
134

 
$
952

 
$
134