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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of investments available for sale
Investments available for sale consist of the following:

December 31, 2018 (In thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Treasury securities
 
$
295,145

 
$
693

 
$
(5,946
)
 
$
289,892

U.S. agency securities
 
33,645

 
—

 
(648
)
 
32,997

U.S. agency mortgage-backed securities
 
649,228

 
2,520

 
(14,570
)
 
637,178

Municipal debt securities(1)
 
481,547

 
5,351

 
(3,019
)
 
483,879

Non-U.S. government securities
 
44,999

 
285

 
(283
)
 
45,001

Corporate debt securities(2)
 
738,964

 
1,005

 
(14,768
)
 
725,201

Residential and commercial mortgage securities
 
122,369

 
686

 
(1,217
)
 
121,838

Asset-backed securities
 
288,371

 
305

 
(3,679
)
 
284,997

Money market funds
 
139,082

 
1

 
—

 
139,083

Total investments available for sale
 
$
2,793,350

 
$
10,846

 
$
(44,130
)
 
$
2,760,066


December 31, 2017 (In thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Treasury securities
 
$
231,905

 
$
2

 
$
(4,102
)
 
$
227,805

U.S. agency securities
 
33,669

 
—

 
(555
)
 
33,114

U.S. agency mortgage-backed securities
 
462,986

 
567

 
(7,516
)
 
456,037

Municipal debt securities(1)
 
457,418

 
9,098

 
(1,261
)
 
465,255

Corporate debt securities(2)
 
610,516

 
4,249

 
(3,037
)
 
611,728

Residential and commercial mortgage securities
 
78,974

 
791

 
(358
)
 
79,407

Asset-backed securities
 
167,638

 
467

 
(183
)
 
167,922

Money market funds
 
263,808

 
—

 
(11
)
 
263,797

Total investments available for sale
 
$
2,306,914

 
$
15,174

 
$
(17,023
)
 
$
2,305,065

_______________________________________________________________________________
 
 
December 31,
 
December 31,
(1) The following table summarizes municipal debt securities as of :
 
2018
 
2017
Special revenue bonds
 
69.0
%
 
63.6
%
General obligation bonds
 
26.0

 
30.7

Certificate of participation bonds
 
3.6

 
4.4

Tax allocation bonds
 
0.9

 
0.8

Special tax bonds
 
0.5

 
0.5

Total
 
100.0
%
 
100.0
%

 
 
December 31,
 
December 31,
(2) The following table summarizes corporate debt securities as of :
 
2018
 
2017
Financial
 
37.1
%
 
45.9
%
Consumer, non-cyclical
 
20.7

 
16.2

Communications
 
12.6

 
7.3

Consumer, cyclical
 
7.6

 
5.3

Energy
 
5.7

 
7.8

Utilities
 
5.0

 
5.3

Industrial
 
4.7

 
6.3

Basic materials
 
3.5

 
2.0

Technology
 
3.1

 
3.9

Total
 
100.0
%
 
100.0
%
Schedule of amortized cost and fair value of investments available for sale by contractual maturity
The amortized cost and fair value of investments available for sale at December 31, 2018, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Because most U.S. agency mortgage-backed securities, residential and commercial mortgage securities and asset-backed securities provide for periodic payments throughout their lives, they are listed below in separate categories.

(In thousands)
 
Amortized
Cost
 
Fair
Value
U.S. Treasury securities:
 
 

 
 

Due in 1 year
 
$
17,315

 
$
17,302

Due after 1 but within 5 years
 
178,245

 
177,346

Due after 5 but within 10 years
 
99,585

 
95,244

Subtotal
 
295,145

 
289,892

U.S. agency securities:
 
 

 
 

Due in 1 year
 
—

 
—

Due after 1 but within 5 years
 
33,645

 
32,997

Subtotal
 
33,645

 
32,997

Municipal debt securities:
 
 

 
 

Due in 1 year
 
9,282

 
9,282

Due after 1 but within 5 years
 
85,488

 
85,205

Due after 5 but within 10 years
 
181,864

 
182,942

Due after 10 years
 
204,913

 
206,450

Subtotal
 
481,547

 
483,879

Non-U.S. government securities:
 
 
 
 
Due in 1 year
 
—

 
—

Due after 1 but within 5 years
 
19,787

 
19,870

Due after 5 but within 10 years
 
25,212

 
25,131

Subtotal
 
44,999

 
45,001

Corporate debt securities:
 
 

 
 

Due in 1 year
 
75,797

 
75,287

Due after 1 but within 5 years
 
395,764

 
390,383

Due after 5 but within 10 years
 
264,223

 
256,576

Due after 10 years
 
3,180

 
2,955

Subtotal
 
738,964

 
725,201

U.S. agency mortgage-backed securities
 
649,228

 
637,178

Residential and commercial mortgage securities
 
122,369

 
121,838

Asset-backed securities
 
288,371

 
284,997

Money market funds
 
139,082

 
139,083

Total investments available for sale
 
$
2,793,350

 
$
2,760,066
Schedule of realized gross gains and losses on sale of investments available for sale
Gross gains and losses realized on the sale of investments available for sale were as follows:

 
 
Year Ended December 31,
(In thousands)
 
2018
 
2017
 
2016
Realized gross gains
 
$
2,201

 
$
2,504

 
$
2,822

Realized gross losses
 
883

 
425

 
788
Schedule of fair value of investments in an unrealized loss position and related unrealized losses
The fair value of investments available for sale in an unrealized loss position and the related unrealized losses were as follows:

 
 
Less than 12 months
 
12 months or more
 
Total
December 31, 2018 (In thousands)
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
U.S. Treasury securities
 
$
45,505

 
$
(215
)
 
$
165,015

 
$
(5,731
)
 
$
210,520

 
$
(5,946
)
U.S. agency securities
 
—

 
—

 
32,997

 
(648
)
 
32,997

 
(648
)
U.S. agency mortgage-backed securities
 
106,177

 
(1,070
)
 
341,579

 
(13,500
)
 
447,756

 
(14,570
)
Municipal debt securities
 
114,442

 
(1,176
)
 
104,930

 
(1,843
)
 
219,372

 
(3,019
)
Non-U.S. government securities
 
13,497

 
(283
)
 
—

 
—

 
13,497

 
(283
)
Corporate debt securities
 
381,912

 
(7,538
)
 
231,124

 
(7,230
)
 
613,036

 
(14,768
)
Residential and commercial mortgage securities
 
51,477

 
(650
)
 
13,321

 
(567
)
 
64,798

 
(1,217
)
Asset-backed securities
 
217,546

 
(3,165
)
 
29,852

 
(514
)
 
247,398

 
(3,679
)
Total
 
$
930,556

 
$
(14,097
)
 
$
918,818

 
$
(30,033
)
 
$
1,849,374

 
$
(44,130
)

 
 
Less than 12 months
 
12 months or more
 
Total
December 31, 2017 (In thousands)
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
U.S. Treasury securities
 
$
151,119

 
$
(1,240
)
 
$
69,454

 
$
(2,862
)
 
$
220,573

 
$
(4,102
)
U.S. agency securities
 
17,320

 
(190
)
 
15,794

 
(365
)
 
33,114

 
(555
)
U.S. agency mortgage-backed securities
 
180,443

 
(1,394
)
 
217,944

 
(6,122
)
 
398,387

 
(7,516
)
Municipal debt securities
 
124,171

 
(817
)
 
23,492

 
(444
)
 
147,663

 
(1,261
)
Corporate debt securities
 
214,371

 
(1,213
)
 
94,261

 
(1,824
)
 
308,632

 
(3,037
)
Residential and commercial mortgage securities
 
29,842

 
(179
)
 
5,988

 
(179
)
 
35,830

 
(358
)
Asset-backed securities
 
58,798

 
(133
)
 
5,828

 
(50
)
 
64,626

 
(183
)
Money market funds
 
59,489

 
(11
)
 
—

 
—

 
59,489

 
(11
)
Total
 
$
835,553

 
$
(5,177
)
 
$
432,761

 
$
(11,846
)
 
$
1,268,314

 
$
(17,023
)
Schedule of net investment income
Net investment income consists of:

 
 
Year Ended December 31,
(In thousands)
 
2018
 
2017
 
2016
Fixed maturities
 
$
63,053

 
$
41,935

 
$
29,865

Short-term investments
 
3,873

 
1,019

 
142

Gross investment income
 
66,926

 
42,954

 
30,007

Investment expenses
 
(2,835
)
 
(2,728
)
 
(2,117
)
Net investment income
 
$
64,091

 
$
40,226

 
$
27,890