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Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Investments [Abstract]  
Available-for-Sale Securities
The following is a summary of available-for-sale securities at June 30, 2019 and December 31, 2018:

  
Fair
Value
  
Cost or
Amortized Cost
  
Gross
Unrealized Gains
  
Gross
Unrealized Losses
  
Net Unrealized
Gains (Losses)
 
June 30, 2019
               
Fixed income securities
               
Agency collateralized mortgage obligations
 
$
15,730
  
$
15,384
  
$
352
  
$
(6
)
 
$
346
 
Agency mortgage-backed securities
  
41,031
   
39,609
   
1,438
   
(16
)
  
1,422
 
Asset-backed securities
  
94,880
   
94,847
   
539
   
(506
)
  
33
 
Bank loans
  
16,074
   
16,279
   
60
   
(265
)
  
(205
)
Certificates of deposit
  
2,835
   
2,835
   
–
   
–
   
–
 
Collateralized mortgage obligations
  
6,165
   
5,686
   
549
   
(70
)
  
479
 
Corporate securities
  
256,318
   
251,977
   
5,185
   
(844
)
  
4,341
 
Mortgage-backed securities
  
42,506
   
41,706
   
946
   
(146
)
  
800
 
Municipal obligations
  
32,834
   
32,177
   
688
   
(31
)
  
657
 
Non-U.S. government obligations
  
31,378
   
31,064
   
326
   
(12
)
  
314
 
U.S. government obligations
  
197,397
   
194,489
   
3,092
   
(184
)
  
2,908
 
Total fixed income securities
 
$
737,148
  
$
726,053
  
$
13,175
  
$
(2,080
)
 
$
11,095
 

  
Fair
Value
  
Cost or
Amortized Cost
  
Gross
Unrealized Gains
  
Gross
Unrealized Losses
  
Net Unrealized
Gains (Losses)
 
December 31, 2018
               
Fixed income securities
               
Agency collateralized mortgage obligations
 
$
10,687
  
$
10,636
  
$
145
  
$
(94
)
 
$
51
 
Agency mortgage-backed securities
  
37,385
   
37,168
   
371
   
(154
)
  
217
 
Asset-backed securities
  
64,422
   
66,241
   
14
   
(1,833
)
  
(1,819
)
Bank loans
  
9,750
   
10,208
   
27
   
(485
)
  
(458
)
Certificates of deposit
  
2,835
   
2,835
   
–
   
–
   
–
 
Collateralized mortgage obligations
  
5,423
   
5,095
   
376
   
(48
)
  
328
 
Corporate securities
  
190,450
   
196,925
   
127
   
(6,602
)
  
(6,475
)
Mortgage-backed securities
  
38,540
   
38,586
   
377
   
(423
)
  
(46
)
Municipal obligations
  
29,155
   
29,102
   
239
   
(186
)
  
53
 
Non-U.S. government obligations
  
25,180
   
25,339
   
6
   
(165
)
  
(159
)
U.S. government obligations
  
178,818
   
178,369
   
1,252
   
(803
)
  
449
 
Total fixed income securities
 
$
592,645
  
$
600,504
  
$
2,934
  
$
(10,793
)
 
$
(7,859
)
Fixed Maturity and Equity Security Investments in Unrealized Loss Position
The following table summarizes, for available-for-sale fixed income securities in an unrealized loss position at June 30, 2019 and  December 31, 2018, the aggregate fair value and gross unrealized loss categorized by the duration individual securities have been continuously in an unrealized loss position.

  
June 30, 2019
  
December 31, 2018
 
  
Number of
Securities
  
Fair
Value
  
Gross
Unrealized Loss
  
Number of
Securities
  
Fair
Value
  
Gross
Unrealized Loss
 
Fixed income securities:
                  
12 months or less
  
81
  
$
76,363
  
$
(1,166
)
  
275
  
$
282,646
  
$
(7,296
)
Greater than 12 months
  
149
   
95,614
   
(914
)
  
217
   
131,001
   
(3,497
)
Total fixed income securities
  
230
  
$
171,977
  
$
(2,080
)
  
492
  
$
413,647
  
$
(10,793
)
                         
Fair Value and Cost or Amortized Cost of Fixed Maturity Investments by Contractual Maturity
The fair value and the cost or amortized costs of fixed income investments at June 30, 2019, organized by contractual maturity, are shown below.  Actual maturities may ultimately differ from contractual maturities because borrowers have, in some cases, the right to call or prepay obligations with or without call or prepayment penalties. Pre-refunded municipal bonds are classified based on their pre-refunded call dates.

  
Fair
Value
  
Cost or
Amortized Cost
 
One year or less
 
$
99,531
  
$
99,574
 
Excess of one year to five years
  
342,358
   
336,988
 
Excess of five years to ten years
  
89,596
   
87,051
 
Excess of ten years
  
11,517
   
10,894
 
Contractual maturities
  
543,002
   
534,507
 
Asset-backed securities
  
194,146
   
191,546
 
Total
 
$
737,148
  
$
726,053
 
Net Realized and Unrealized Gains (Losses) on Investments
Following is a summary of the components of net realized and unrealized gains (losses) on investments for the periods presented in the accompanying condensed consolidated statements of operations.

  
Three Months Ended
June 30
  
Six Months Ended
June 30
 
  
2019
  
2018
  
2019
  
2018
 
Gross gains on available-for-sale fixed income securities sold during the period
 
$
4,132
  
$
3,691
  
$
7,303
  
$
6,134
 
Gross losses on available-for-sale fixed income securities sold during the period
  
(3,154
)
  
(3,088
)
  
(6,681
)
  
(5,796
)
                 
Other-than-temporary impairments
  
(86
)
  
–
   
(346
)
  
–
 
                 
Change in value of limited partnership investments
  
314
   
(2,842
)
  
722
   
(5,445
)
                 
Gains (losses) on equity securities:
                
Realized gains (losses) on equity securities sold during the period
  
(265
)
  
312
   
51
   
953
 
Unrealized gains (losses) on equity securities held at the end of the period
  
1,948
   
(1,508
)
  
7,867
   
(3,814
)
Realized and unrealized gains (losses) on equity securities during the period
  
1,683
   
(1,196
)
  
7,918
   
(2,861
)
                 
Net realized and unrealized gains (losses) on investments
 
$
2,889
  
$
(3,435
)
 
$
8,916
  
$
(7,968
)