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

  
Fair
Value
  
Cost or
Amortized Cost
  
Gross
Unrealized Gains
  
Gross
Unrealized Losses
  
Net Unrealized
Gains (Losses)
 
March 31, 2019
               
Fixed income securities
               
Agency collateralized mortgage obligations
 
$
15,773
  
$
15,567
  
$
265
  
$
(59
)
 
$
206
 
Agency mortgage-backed securities
  
41,283
   
40,486
   
849
   
(52
)
  
797
 
Asset-backed securities
  
77,307
   
77,890
   
180
   
(763
)
  
(583
)
Bank loans
  
11,284
   
11,372
   
38
   
(126
)
  
(88
)
Certificates of deposit
  
2,835
   
2,835
   
–
   
–
   
–
 
Collateralized mortgage obligations
  
5,433
   
5,072
   
433
   
(72
)
  
361
 
Corporate securities
  
227,529
   
227,017
   
2,110
   
(1,598
)
  
512
 
Mortgage-backed securities
  
37,984
   
37,699
   
588
   
(303
)
  
285
 
Municipal obligations
  
30,357
   
30,056
   
383
   
(82
)
  
301
 
Non-U.S. government obligations
  
30,879
   
30,810
   
162
   
(93
)
  
69
 
U.S. government obligations
  
191,309
   
190,324
   
1,469
   
(484
)
  
985
 
Total fixed income securities
 
$
671,973
  
$
669,128
  
$
6,477
  
$
(3,632
)
 
$
2,845
 

  
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 March 31, 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.

  
March 31, 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
  
85
  
$
96,462
  
$
(1,570
)
  
275
  
$
282,646
  
$
(7,296
)
Greater than 12 months
  
253
   
208,253
   
(2,062
)
  
217
   
131,001
   
(3,497
)
Total fixed income securities
  
338
  
$
304,715
  
$
(3,632
)
  
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 March 31, 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
 
$
95,201
  
$
95,347
 
Excess of one year to five years
  
315,983
   
314,909
 
Excess of five years to ten years
  
81,812
   
80,997
 
Excess of ten years
  
6,630
   
6,233
 
Contractual maturities
  
499,626
   
497,486
 
Asset-backed securities
  
172,347
   
171,642
 
Total
 
$
671,973
  
$
669,128
 
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
March 31
 
  
2019
  
2018
 
       
Gross gains on available-for-sale fixed income securities sold during the period
 
$
3,171
  
$
2,443
 
Gross losses on available-for-sale fixed income securities sold during the period
  
(3,527
)
  
(2,708
)
         
Other-than-temporary impairments
  
(260
)
  
–
 
         
Change in value of limited partnership investments
  
408
   
(2,603
)
         
Gains (losses) on equity securities:
        
Realized gains on equity securities sold during the period
  
317
   
641
 
Unrealized gains (losses) on equity securities held at the end of the period
  
5,919
   
(2,306
)
Realized and unrealized gains (losses) on equity securities during the period
  
6,236
   
(1,665
)
         
Net realized and unrealized gains (losses) on investments
 
$
6,028
  
$
(4,533
)