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Fair Value (Tables)
 9 Months Ended
Sep. 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)
  
September 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
  
$
352,926
    
$
-
    
$
352,926
    
$
-
  
Obligations of U.S. States and political subdivisions
    
714,279
      
-
      
714,279
      
-
  
Corporate securities
    
5,006,937
      
-
      
4,999,371
      
7,566
  
Asset-backed securities
    
438,397
      
-
      
438,397
      
-
  
Mortgage-backed securities
                                
Commercial
    
284,809
      
-
      
284,809
      
-
  
Agency residential
    
2,426,067
      
-
      
2,426,067
      
-
  
Non-agency residential
    
978
      
-
      
978
      
-
  
Foreign government securities
    
1,300,961
      
-
      
1,300,961
      
-
  
Foreign corporate securities
    
2,965,606
      
-
      
2,959,481
      
6,125
  
Total fixed maturities, market value
    
13,490,960
      
-
      
13,477,269
      
13,691
  
                                 
Fixed maturities, fair value
    
-
      
-
      
-
      
-
  
Equity securities, market value
    
112,999
      
97,871
      
15,128
      
-
  
Equity securities, fair value
    
1,357,311
      
1,267,765
      
89,546
      
-
  
                                 
Liabilities:
                                
Equity index put option contracts
  
$
52,247
    
$
-
    
$
-
    
$
52,247

 

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 September 30, 2015
    
Nine Months Ended September 30, 2015
  
   
Corporate
    
Foreign
        
Corporate
        
Foreign
      
(Dollars in thousands)
  
Securities
    
Corporate
    
Total
    
Securities
    
CMBS
    
Corporate
    
Total
  
Beginning balance
  
$
1,958
    
$
7,837
    
$
9,795
    
$
-
    
$
8,597
    
$
7,166
    
$
15,763
  
Total gains or (losses) (realized/unrealized)
                                                        
Included in earnings
    
(8
)
    
62
      
54
      
(4
)
    
-
      
177
      
173
  
Included in other comprehensive income (loss)
    
(137
)
    
(1,287
)
    
(1,424
)
    
(139
)
    
-
      
(1,216
)
    
(1,355
)
Purchases, issuances and settlements
    
1,723
      
-
      
1,723
      
3,651
      
-
      
-
      
3,651
  
Transfers in and/or (out) of Level 3
    
4,030
      
(487
)
    
3,543
      
4,058
      
(8,597
)
    
(2
)
    
(4,541
)
Ending balance
  
$
7,566
    
$
6,125
    
$
13,691
    
$
7,566
    
$
-
    
$
6,125
    
$
13,691
  
                                                         
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 September 30, 2014
    
Nine Months Ended September 30, 2014
  
   
Corporate
  
Asset-backed
  
Foreign
  
Non-agency
  
Agency
      
Corporate
  
Asset-backed
  
Foreign
  
Non-agency
  
Agency
    
(Dollars in thousands)
  
Securities
  
Securities
  
Corporate
  
RMBS
  
RMBS
  
Total
  
Securities
  
Securities
  
Corporate
  
RMBS
  
RMBS
  
Total
Beginning balance
  
$
-
    
$
3,000
    
$
-
    
$
259
    
$
-
    
$
3,259
    
$
-
    
$
5,299
    
$
481
    
$
347
    
$
-
    
$
6,127
  
Total gains or (losses) (realized/unrealized)
                                                                                                
Included in earnings
    
-
      
1,203
      
-
      
187
      
-
      
1,390
      
-
      
1,259
      
18
      
329
      
-
      
1,606
  
Included in other comprehensive income (loss)
    
42
      
(201
)
    
(62
)
    
(114
)
    
-
      
(335
)
    
42
      
(126
)
    
(82
)
    
(138
)
    
-
      
(304
)
Purchases, issuances and settlements
    
1,274
      
22,797
      
4,517
      
(332
)
    
29,845
      
58,101
      
1,274
      
21,303
      
4,038
      
(538
)
    
29,845
      
55,922
  
Transfers in and/or (out) of Level 3
    
-
      
(1,431
)
    
-
      
-
      
-
      
(1,431
)
    
-
      
(2,367
)
    
-
      
-
      
-
      
(2,367
)
Ending balance
  
$
1,316
    
$
25,368
    
$
4,455
    
$
-
    
$
29,845
    
$
60,984
    
$
1,316
    
$
25,368
    
$
4,455
    
$
-
    
$
29,845
    
$
60,984
  
                                                                                                 
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
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
(Dollars in thousands)
  
2015
    
2014
    
2015
    
2014
  
Liabilities:
                
Balance, beginning of period
  
$
40,819
    
$
33,309
    
$
47,022
    
$
35,423
  
Total (gains) or losses (realized/unrealized)
                                
Included in earnings
    
11,428
      
(1,855
)
    
5,225
      
(3,968
)
Included in other comprehensive income (loss)
    
-
      
-
      
-
      
-
  
Purchases, issuances and settlements
    
-
      
-
      
-
      
-
  
Transfers in and/or (out) of Level 3
    
-
      
-
      
-
      
-
  
Balance, end of period
  
$
52,247
    
$
31,455
    
$
52,247
    
$
31,455
  
                                 
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.)