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Fair Value (Tables)
 6 Months Ended
Jun. 30, 2015
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)
  
June 30, 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
  
$
348,252
    
$
-
    
$
348,252
    
$
-
  
Obligations of U.S. States and political subdivisions
    
738,719
      
-
      
738,719
      
-
  
Corporate securities
    
5,036,615
      
-
      
5,034,657
      
1,958
  
Asset-backed securities
    
452,082
      
-
      
452,082
      
-
  
Mortgage-backed securities
                                
Commercial
    
305,460
      
-
      
305,460
      
-
  
Agency residential
    
2,208,958
      
-
      
2,208,958
      
-
  
Non-agency residential
    
1,349
      
-
      
1,349
      
-
  
Foreign government securities
    
1,348,039
      
-
      
1,348,039
      
-
  
Foreign corporate securities
    
3,035,327
      
-
      
3,027,490
      
7,837
  
Total fixed maturities, market value
    
13,474,801
      
-
      
13,465,006
      
9,795
  
                                 
Fixed maturities, fair value
    
228
      
-
      
228
      
-
  
Equity securities, market value
    
137,516
      
122,578
      
14,938
      
-
  
Equity securities, fair value
    
1,483,803
      
1,365,367
      
118,436
      
-
  
                                 
Liabilities:
                                
Equity index put option contracts
  
$
40,819
    
$
-
    
$
-
    
$
40,819
  

   
Fair Value Measurement Using:
  
       
Quoted Prices
          
       
in Active
    
Significant
      
       
Markets for
    
Other
    
Significant
  
       
Identical
    
Observable
    
Unobservable
  
       
Assets
    
Inputs
    
Inputs
  
(Dollars in thousands)
  
December 31, 2014
  
(Level 1)
    
(Level 2)
    
(Level 3)
  
Assets:
                
Fixed maturities, market value
                
U.S. Treasury securities and obligations of
                
U.S. government agencies and corporations
  
$
231,038
    
$
-
    
$
231,038
    
$
-
  
Obligations of U.S. States and political subdivisions
    
824,472
      
-
      
824,472
      
-
  
Corporate securities
    
4,706,985
      
-
      
4,706,985
      
-
  
Asset-backed securities
    
341,222
      
-
      
341,222
      
-
  
Mortgage-backed securities
                                
Commercial
    
241,685
      
-
      
233,088
      
8,597
  
Agency residential
    
2,183,164
      
-
      
2,183,164
      
-
  
Non-agency residential
    
2,731
      
-
      
2,731
      
-
  
Foreign government securities
    
1,532,455
      
-
      
1,532,455
      
-
  
Foreign corporate securities
    
3,037,315
      
-
      
3,030,149
      
7,166
  
Total fixed maturities, market value
    
13,101,067
      
-
      
13,085,304
      
15,763
  
                                 
Fixed maturities, fair value
    
1,509
      
-
      
1,509
      
-
  
Equity securities, market value
    
140,210
      
124,295
      
15,915
      
-
  
Equity securities, fair value
    
1,447,820
      
1,337,396
      
110,424
      
-
  
                                 
Liabilities:
                                
Equity index put option contracts
  
$
47,022
    
$
-
    
$
-
    
$
47,022
  
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type

   
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.)
                                                        



   
Three Months Ended June 30, 2014
    
Six Months Ended June 30, 2014
  
   
Asset-backed
    
Foreign
    
Non-agency
        
Asset-backed
    
Foreign
    
Non-agency
      
(Dollars in thousands)
  
Securities
    
Corporate
    
RMBS
    
Total
    
Securities
    
Corporate
    
RMBS
    
Total
  
Beginning balance
  
$
3,672
    
$
473
    
$
264
    
$
4,409
    
$
5,299
    
$
481
    
$
347
    
$
6,127
  
Total gains or (losses) (realized/unrealized)
                                                                
Included in earnings
    
38
      
17
      
4
      
59
      
56
      
18
      
142
      
216
  
Included in other comprehensive income (loss)
    
42
      
(20
)
    
(3
)
    
19
      
75
      
(20
)
    
(24
)
    
31
  
Purchases, issuances and settlements
    
(752
)
    
(470
)
    
(6
)
    
(1,228
)
    
(1,494
)
    
(479
)
    
(206
)
    
(2,179
)
Transfers in and/or (out) of Level 3
    
-
      
-
      
-
      
-
      
(936
)
    
-
      
-
      
(936
)
Ending balance
  
$
3,000
    
$
-
    
$
259
    
$
3,259
    
$
3,000
    
$
-
    
$
259
    
$
3,259
  
                                                                 
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)
  
2015
    
2014
    
2015
    
2014
  
Liabilities:
                
Balance, beginning of period
  
$
47,264
    
$
37,083
    
$
47,022
    
$
35,423
  
Total (gains) or losses (realized/unrealized)
                                
Included in earnings
    
(6,445
)
    
(3,774
)
    
(6,203
)
    
(2,113
)
Included in other comprehensive income (loss)
    
-
      
-
      
-
      
-
  
Purchases, issuances and settlements
    
-
      
-
      
-
      
-
  
Transfers in and/or (out) of Level 3
    
-
      
-
      
-
      
-
  
Balance, end of period
  
$
40,819
    
$
33,309
    
$
40,819
    
$
33,309
  
                                 
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.)