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Fair Value (Tables)
 6 Months Ended
Jun. 30, 2016
Fair Value [Abstract]  
Fair Value Measurement Levels For All Assets, Recorded At Fair And Market Value
Fair Value Measurement Using:
  
         
Quoted Prices
              
         
in Active
    
Significant
        
         
Markets for
    
Other
    
Significant
  
         
Identical
    
Observable
    
Unobservable
  
         
Assets
    
Inputs
    
Inputs
  
(Dollars in thousands)
  
June 30, 2016
    
(Level 1)
    
(Level 2)
    
(Level 3)
  
Assets:
                        
Fixed maturities, market value
                        
U.S. Treasury securities and obligations of
                        
U.S. government agencies and corporations
  
$
391,944
    
$
-
    
$
391,944
    
$
-
  
Obligations of U.S. States and political subdivisions
    
749,912
      
-
      
749,912
      
-
  
Corporate securities
    
2,066,163
      
-
      
2,033,753
      
32,410
  
Asset-backed securities
    
168,913
      
-
      
168,913
      
-
  
Mortgage-backed securities
                                
Commercial
    
75,101
      
-
      
75,101
      
-
  
Agency residential
    
767,696
      
-
      
767,696
      
-
  
Non-agency residential
    
120
      
-
      
120
      
-
  
Foreign government securities
    
533,403
      
-
      
533,403
      
-
  
Foreign corporate securities
    
1,015,497
      
-
      
1,013,476
      
2,021
  
Total fixed maturities, market value
    
5,768,749
      
-
      
5,734,318
      
34,431
  
                                 
Equity securities, fair value
    
976,879
      
915,003
      
61,876
      
-
  
Other invested assets, fair value
    
1,772,458
      
-
      
-
      
1,772,458
  


 
Fair Value Measurement Using:
  
         
Quoted Prices
              
         
in Active
    
Significant
        
         
Markets for
    
Other
    
Significant
  
         
Identical
    
Observable
    
Unobservable
  
         
Assets
    
Inputs
    
Inputs
  
(Dollars in thousands)
  
December 31, 2015
    
(Level 1)
    
(Level 2)
    
(Level 3)
  
Assets:
                        
Fixed maturities, market value
                        
U.S. Treasury securities and obligations of
                        
U.S. government agencies and corporations
  
$
330,985
    
$
-
    
$
330,985
    
$
-
  
Obligations of U.S. States and political subdivisions
    
703,075
      
-
      
703,075
      
-
  
Corporate securities
    
1,968,558
      
-
      
1,964,625
      
3,933
  
Asset-backed securities
    
144,982
      
-
      
144,982
      
-
  
Mortgage-backed securities
                                
Commercial
    
62,446
      
-
      
62,446
      
-
  
Agency residential
    
712,298
      
-
      
712,298
      
-
  
Non-agency residential
    
150
      
-
      
150
      
-
  
Foreign government securities
    
463,074
      
-
      
463,074
      
-
  
Foreign corporate securities
    
970,909
      
-
      
969,316
      
1,593
  
Total fixed maturities, market value
    
5,356,477
      
-
      
5,350,951
      
5,526
  
                                 
Fixed maturities, fair value
    
2,102
      
-
      
2,102
      
-
  
Equity securities, fair value
    
1,215,377
      
1,153,310
      
62,067
      
-
  
Other invested assets, fair value
    
1,773,214
      
-
      
-
      
1,773,214
  
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type
Three Months Ended June 30, 2016
    
Six Months Ended June 30, 2016
  
   
Corporate
    
Foreign
          
Corporate
    
Foreign
        
(Dollars in thousands)
  
Securities
    
Corporate
    
Total
    
Securities
    
Corporate
    
Total
  
Beginning balance
  
$
15,706
    
$
596
    
$
16,302
    
$
3,933
    
$
1,593
    
$
5,526
  
Total gains or (losses) (realized/unrealized)
                                                
Included in earnings
    
(18
)
    
-
      
(18
)
    
(10
)
    
(997
)
    
(1,007
)
Included in other comprehensive income (loss)
    
(27
)
    
1,425
      
1,398
      
(33
)
    
1,425
      
1,392
  
Purchases, issuances and settlements
    
16,749
      
-
      
16,749
      
28,520
      
-
      
28,520
  
Transfers in and/or (out) of Level 3
    
-
      
-
      
-
      
-
      
-
      
-
  
Ending balance
  
$
32,410
    
$
2,021
    
$
34,431
    
$
32,410
    
$
2,021
    
$
34,431
  
                                                 
The amount of total gains or losses for the period included
                                                
in earnings (or changes in net assets) attributable to the
                                                
change in unrealized gains or losses relating to assets
                                                
still held at the reporting date
  
$
-
    
$
-
    
$
-
    
$
-
    
$
(997
)
  
$
(997
)
                                                 
(Some amounts may not reconcile due to rounding.)
                                            

 

Three Months Ended June 30, 2015
    
Six Months Ended June 30, 2015
  
   
Corporate
    
Foreign
          
Corporate
          
Foreign
        
(Dollars in thousands)
  
Securities
    
Corporate
    
Total
    
Securities
    
CMBS
    
Corporate
    
Total
  
Beginning balance
  
$
2,653
    
$
6,125
    
$
8,778
    
$
-
    
$
8,597
    
$
7,166
    
$
15,763
  
Total gains or (losses) (realized/unrealized)
                                                        
Included in earnings
    
2
      
58
      
60
      
4
      
-
      
115
      
119
  
Included in other comprehensive income (loss)
    
(3
)
    
1,169
      
1,166
      
(2
)
    
-
      
71
      
69
  
Purchases, issuances and settlements
    
(12
)
    
-
      
(12
)
    
1,928
      
-
      
-
      
1,928
  
Transfers in and/or (out) of Level 3
    
(682
)
    
485
      
(197
)
    
28
      
(8,597
)
    
485
      
(8,084
)
Ending balance
  
$
1,958
    
$
7,837
    
$
9,795
    
$
1,958
    
$
-
    
$
7,837
    
$
9,795
  
                                                         
The amount of total gains or losses for the period
                                                        
included in earnings (or changes in net assets)
                                                        
 attributable to the change in unrealized gains
                                                        
or losses relating to assets still held at the
                                                        
reporting date
  
$
-
    
$
-
    
$
-
    
$
-
    
$
-
    
$
-
    
$
-
  
                                                         
(Some amounts may not reconcile due to rounding.)
                                                        
Fair Value Measurements Using Significant Unobservable Inputs for Equity Index Put Option Contracts
   
Three months ended
    
Six months ended
  
   
June 30,
    
June 30,
  
(Dollars in thousands)
  
2016
    
2015
    
2016
    
2015
  
Other invested assets, fair value:
                        
Beginning balance
  
$
1,773,214
    
$
-
    
$
1,773,214
    
$
-
  
Total gains or (losses) (realized/unrealized)
                                
Included in earnings
    
(756
)
    
-
      
(756
)
    
-
  
Included in other comprehensive income (loss)
    
-
      
-
      
-
      
-
  
Purchases, issuances and settlements
    
-
      
-
      
-
      
-
  
Transfers in and/or (out) of Level 3
    
-
      
-
      
-
      
-
  
Ending balance
  
$
1,772,458
    
$
-
    
$
1,772,458
    
$
-
  
                                 
The amount of total gains or losses for the period included in earnings
                                
(or changes in net assets) attributable to the change in unrealized
                                
gains or losses relating to assets still held at the reporting date
  
$
-
    
$
-
    
$
-
    
$
-
  
                                 
(Some amounts may not reconcile due to rounding.)