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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Shareholders' Equity [Abstract]  
Reconciliation of Components of Accumulated Other Comprehensive Income (Loss)
A reconciliation of the components of accumulated other comprehensive income (loss) at December 31 is as follows:

  
2018
  
2017
 
Investments:
      
Total unrealized gain (loss) before federal income tax expense (benefit)
 
$
(7,859
)
 
$
71,848
 
Deferred tax benefit (liability)
  
1,651
   
(25,148
)
Net unrealized gains (losses) on investments
  
(6,208
)
  
46,700
 
         
Foreign exchange adjustment:
        
Total unrealized losses
  
(1,442
)
  
(475
)
Deferred tax benefit
  
303
   
166
 
Net unrealized losses on foreign exchange adjustment
  
(1,139
)
  
(309
)
         
Accumulated other comprehensive income (loss)
 
$
(7,347
)
 
$
46,391
 
Details of Changes in Net Unrealized Gains (Losses) on Investments
Details of changes in net unrealized gains (losses) on investments for the years ended December 31 are as follows:

  
2018
  
2017
  
2016
 
Investments:
         
Pre-tax holding gains (losses) on debt and equity securities arising during period (1)
 
$
(12,253
)
 
$
26,677
  
$
13,259
 
Less: applicable federal income tax expense (benefit)
  
(2,573
)
  
9,337
   
4,641
 
   
(9,680
)
  
17,340
   
8,618
 
             
Pre-tax gains (losses) on debt and equity securities included in net income (loss) during period (1)
  
(3,560
)
  
7,217
   
20,755
 
Less: applicable federal income tax expense (benefit)
  
(748
)
  
2,526
   
7,264
 
   
(2,812
)
  
4,691
   
13,491
 
             
Change in unrealized gains (losses) on investments
 
$
(6,868
)
 
$
12,649
  
$
(4,873
)

(1) Effective January 1, 2018, the Company adopted ASU 2016-01 and unrealized gains (losses) related to equity securities are no longer reflected in accumulated other comprehensive income (loss).  Prior periods have not been restated to conform to the current presentation.