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Fair Value (Tables)
 3 Months Ended
Mar. 31, 2016
Fair Value [Abstract]  
Fair Value Measurement Levels For All Assets And Liabilities

       
Fair Value Measurement Using:
  
       
Quoted Prices
          
       
in Active
    
Significant
      
       
Markets for
    
Other
    
Significant
  
       
Identical
    
Observable
    
Unobservable
  
       
Assets
    
Inputs
    
Inputs
  
(Dollars in thousands)
  
March 31, 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
  
$
919,512
    
$
-
    
$
919,512
    
$
-
  
Obligations of U.S. States and political subdivisions
    
702,077
      
-
      
702,077
      
-
  
Corporate securities
    
4,812,038
      
-
      
4,796,332
      
15,706
  
Asset-backed securities
    
515,719
      
-
      
515,719
      
-
  
Mortgage-backed securities
                                
Commercial
    
273,018
      
-
      
273,018
      
-
  
Agency residential
    
2,473,289
      
-
      
2,473,289
      
-
  
Non-agency residential
    
836
      
-
      
836
      
-
  
Foreign government securities
    
1,322,743
      
-
      
1,322,743
      
-
  
Foreign corporate securities
    
2,742,420
      
-
      
2,741,824
      
596
  
Total fixed maturities, market value
    
13,761,652
      
-
      
13,745,350
      
16,302
  
                                 
Fixed maturities, fair value
    
1,870
      
-
      
1,870
      
-
  
Equity securities, market value
    
114,388
      
96,771
      
17,617
      
-
  
Equity securities, fair value
    
1,313,404
      
1,253,346
      
60,058
      
-
  
                                 
Liabilities:
                                
Equity index put option contracts
  
$
43,725
    
$
-
    
$
-
    
$
43,725
  


       
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
  
$
816,877
    
$
-
    
$
816,877
    
$
-
  
Obligations of U.S. States and political subdivisions
    
703,075
      
-
      
703,075
      
-
  
Corporate securities
    
4,804,863
      
-
      
4,800,930
      
3,933
  
Asset-backed securities
    
467,226
      
-
      
467,226
      
-
  
Mortgage-backed securities
                                
Commercial
    
266,299
      
-
      
266,299
      
-
  
Agency residential
    
2,320,524
      
-
      
2,320,524
      
-
  
Non-agency residential
    
898
      
-
      
898
      
-
  
Foreign government securities
    
1,259,181
      
-
      
1,259,181
      
-
  
Foreign corporate securities
    
2,718,351
      
-
      
2,716,758
      
1,593
  
Total fixed maturities, market value
    
13,357,294
      
-
      
13,351,768
      
5,526
  
                                 
Fixed maturities, fair value
    
2,102
      
-
      
2,102
      
-
  
Equity securities, market value
    
108,940
      
91,907
      
17,033
      
-
  
Equity securities, fair value
    
1,337,733
      
1,275,666
      
62,067
      
-
  
                                 
Liabilities:
                                
Equity index put option contracts
  
$
40,705
    
$
-
    
$
-
    
$
40,705
  
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type
Three Months Ended March 31, 2016
    
Three Months Ended March 31, 2015
  
   
Corporate
    
Foreign
        
Corporate
        
Foreign
      
(Dollars in thousands)
  
Securities
    
Corporate
    
Total
    
Securities
    
CMBS
    
Corporate
    
Total
  
Beginning balance
  
$
3,933
    
$
1,593
    
$
5,526
    
$
-
    
$
8,597
    
$
7,166
    
$
15,763
  
Total gains or (losses) (realized/unrealized)
                                                        
Included in earnings
    
8
      
(997
)
  
$
(989
)
    
2
      
-
      
57
      
59
  
Included in other comprehensive income (loss)
    
(6
)
    
-
    
$
(6
)
    
1
      
-
      
(1,098
)
    
(1,097
)
Purchases, issuances and settlements
    
11,771
      
-
    
$
11,771
      
1,940
      
-
      
-
      
1,940
  
Transfers in and/or (out) of Level 3
    
-
      
-
    
$
-
      
710
      
(8,597
)
    
-
      
(7,887
)
Ending balance
  
$
15,706
    
$
596
    
$
16,302
    
$
2,653
    
$
-
    
$
6,125
    
$
8,778
  
                                                         
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.)
                                                        
Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts
   
Three Months Ended
  
   
March 31,
  
(Dollars in thousands)
  
2016
    
2015
  
Liabilities:
        
Balance, beginning of period
  
$
40,705
    
$
47,022
  
Total (gains) or losses (realized/unrealized)
                
Included in earnings
    
3,020
      
242
  
Included in other comprehensive income (loss)
    
-
      
-
  
Purchases, issuances and settlements
    
-
      
-
  
Transfers in and/or (out) of Level 3
    
-
      
-
  
Balance, end of period
  
$
43,725
    
$
47,264
  
                 
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 liabilities still held at the reporting date
  
$
-
    
$
-
  
                 
(Some amounts may not reconcile due to rounding.)