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Investments (Tables)
 9 Months Ended
Sep. 30, 2015
Investments [Abstract]  
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments
 
At September 30, 2015
   
Amortized
    
Unrealized
    
Unrealized
    
Market
    
OTTI in AOCI
  
(Dollars in thousands)
  
Cost
    
Appreciation
    
Depreciation
    
Value
    
(a)
  
Fixed maturity securities
                    
U.S. Treasury securities and obligations of
                    
U.S. government agencies and corporations
  
$
337,271
    
$
15,725
    
$
(70
)
  
$
352,926
    
$
-
  
Obligations of U.S. states and political subdivisions
    
683,715
      
32,087
      
(1,523
)
    
714,279
      
-
  
Corporate securities
    
4,964,570
      
118,763
      
(76,396
)
    
5,006,937
      
2,006
  
Asset-backed securities
    
437,376
      
2,575
      
(1,554
)
    
438,397
      
-
  
Mortgage-backed securities
                                        
Commercial
    
277,907
      
7,697
      
(795
)
    
284,809
      
-
  
Agency residential
    
2,392,937
      
39,295
      
(6,165
)
    
2,426,067
      
-
  
Non-agency residential
    
971
      
53
      
(46
)
    
978
      
-
  
Foreign government securities
    
1,285,006
      
60,837
      
(44,882
)
    
1,300,961
      
(2
)
Foreign corporate securities
    
2,921,960
      
115,881
      
(72,235
)
    
2,965,606
      
39
  
Total fixed maturity securities
  
$
13,301,713
    
$
392,913
    
$
(203,666
)
  
$
13,490,960
    
$
2,043
  
Equity securities
  
$
127,411
    
$
3,509
    
$
(17,921
)
  
$
112,999
    
$
-
  



   
At December 31, 2014
   
Amortized
    
Unrealized
    
Unrealized
    
Market
    
OTTI in AOCI
  
(Dollars in thousands)
  
Cost
    
Appreciation
    
Depreciation
    
Value
    
(a)
  
Fixed maturity securities
                    
U.S. Treasury securities and obligations of
                    
U.S. government agencies and corporations
  
$
221,052
    
$
10,290
    
$
(304
)
  
$
231,038
    
$
-
  
Obligations of U.S. states and political subdivisions
    
783,129
      
41,969
      
(626
)
    
824,472
      
-
  
Corporate securities
    
4,626,002
      
143,889
      
(62,906
)
    
4,706,985
      
(6,910
)
Asset-backed securities
    
340,761
      
1,691
      
(1,230
)
    
341,222
      
-
  
Mortgage-backed securities
                                        
Commercial
    
231,439
      
10,675
      
(429
)
    
241,685
      
-
  
Agency residential
    
2,157,182
      
37,555
      
(11,573
)
    
2,183,164
      
-
  
Non-agency residential
    
2,734
      
54
      
(57
)
    
2,731
      
-
  
Foreign government securities
    
1,488,144
      
71,177
      
(26,866
)
    
1,532,455
      
-
  
Foreign corporate securities
    
2,980,716
      
109,673
      
(53,074
)
    
3,037,315
      
-
  
Total fixed maturity securities
  
$
12,831,159
    
$
426,973
    
$
(157,065
)
  
$
13,101,067
    
$
(6,910
)
Equity securities
  
$
148,326
    
$
3,831
    
$
(11,947
)
  
$
140,210
    
$
-
  
 
(a)  Represents the amount of OTTI recognized in AOCI.  Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity
   
At September 30, 2015
    
At December 31, 2014
  
   
Amortized
    
Market
    
Amortized
    
Market
  
(Dollars in thousands)
  
Cost
    
Value
    
Cost
    
Value
  
Fixed maturity securities – available for sale:
                
    Due in one year or less
  
$
1,080,129
    
$
1,088,140
    
$
1,183,247
    
$
1,189,416
  
    Due after one year through five years
    
5,906,738
      
5,991,760
      
5,646,466
      
5,726,277
  
    Due after five years through ten years
    
2,377,276
      
2,382,188
      
2,270,073
      
2,313,672
  
    Due after ten years
    
828,380
      
878,621
      
999,257
      
1,102,900
  
Asset-backed securities
    
437,376
      
438,397
      
340,761
      
341,222
  
Mortgage-backed securities:
                                
Commercial
    
277,906
      
284,809
      
231,439
      
241,685
  
Agency residential
    
2,392,937
      
2,426,067
      
2,157,182
      
2,183,164
  
Non-agency residential
    
971
      
978
      
2,734
      
2,731
  
Total fixed maturity securities
  
$
13,301,713
    
$
13,490,960
    
$
12,831,159
    
$
13,101,067
  
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
(Dollars in thousands)
  
2015
    
2014
    
2015
    
2014
  
Increase (decrease) during the period between the market value and cost
                
of investments carried at market value, and deferred taxes thereon:
                
Fixed maturity securities
  
$
(71,706
)
  
$
(87,859
)
  
$
(89,616
)
  
$
70,010
  
Fixed maturity securities, other-than-temporary impairment
    
(253
)
    
(261
)
    
8,954
      
(180
)
Equity securities
    
(4,415
)
    
(3,287
)
    
(6,295
)
    
3,327
  
Change in unrealized appreciation (depreciation), pre-tax
    
(76,374
)
    
(91,407
)
    
(86,957
)
    
73,157
  
Deferred tax benefit (expense)
    
9,919
      
11,649
      
5,563
      
(9,480
)
Deferred tax benefit (expense), other-than-temporary impairment
    
(8
)
    
-
      
(3,415
)
    
-
  
Change in unrealized appreciation (depreciation),
                                
net of deferred taxes, included in shareholders' equity
  
$
(66,463
)
  
$
(79,758
)
  
$
(84,809
)
  
$
63,677
  
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type

   
Duration of Unrealized Loss at September 30, 2015 By Security Type
   
Less than 12 months
  
Greater than 12 months
  
Total
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities - available for sale
                        
U.S. Treasury securities and obligations of
                        
U.S. government agencies and corporations
  
$
201
    
$
(1
)
  
$
1,844
    
$
(69
)
  
$
2,045
    
$
(70
)
Obligations of U.S. states and political subdivisions
    
20,162
      
(316
)
    
35,460
      
(1,207
)
    
55,622
      
(1,523
)
Corporate securities
    
1,323,515
      
(51,785
)
    
425,091
      
(24,611
)
    
1,748,606
      
(76,396
)
Asset-backed securities
    
89,526
      
(674
)
    
44,765
      
(880
)
    
134,291
      
(1,554
)
Mortgage-backed securities
                                                
Commercial
    
44,260
      
(795
)
    
-
      
-
      
44,260
      
(795
)
Agency residential
    
343,504
      
(2,182
)
    
382,730
      
(3,983
)
    
726,234
      
(6,165
)
Non-agency residential
    
176
      
(2
)
    
44
      
(44
)
    
220
      
(46
)
Foreign government securities
    
299,055
      
(22,177
)
    
183,387
      
(22,705
)
    
482,442
      
(44,882
)
Foreign corporate securities
    
699,077
      
(40,165
)
    
279,126
      
(32,070
)
    
978,203
      
(72,235
)
Total fixed maturity securities
  
$
2,819,476
    
$
(118,097
)
  
$
1,352,447
    
$
(85,569
)
  
$
4,171,923
    
$
(203,666
)
Equity securities
    
-
      
-
      
97,871
      
(17,921
)
    
97,871
      
(17,921
)
Total
  
$
2,819,476
    
$
(118,097
)
  
$
1,450,318
    
$
(103,490
)
  
$
4,269,794
    
$
(221,587

 

 

  
Duration of Unrealized Loss at December 31, 2014 By Security Type
   
Less than 12 months
  
Greater than 12 months
  
Total
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities - available for sale
                        
U.S. Treasury securities and obligations of
                        
U.S. government agencies and corporations
  
$
13,187
    
$
(20
)
  
$
26,897
    
$
(284
)
  
$
40,084
    
$
(304
)
Obligations of U.S. states and political subdivisions
    
20,428
      
(242
)
    
18,199
      
(384
)
    
38,627
      
(626
)
Corporate securities
    
1,245,830
      
(55,388
)
    
362,320
      
(7,518
)
    
1,608,150
      
(62,906
)
Asset-backed securities
    
192,253
      
(1,230
)
    
-
      
-
      
192,253
      
(1,230
)
Mortgage-backed securities
                                                
Commercial
    
28,191
      
(123
)
    
9,777
      
(306
)
    
37,968
      
(429
)
Agency residential
    
141,807
      
(172
)
    
678,972
      
(11,401
)
    
820,779
      
(11,573
)
Non-agency residential
    
-
      
-
      
266
      
(57
)
    
266
      
(57
)
Foreign government securities
    
235,725
      
(15,415
)
    
139,200
      
(11,451
)
    
374,925
      
(26,866
)
Foreign corporate securities
    
567,905
      
(36,926
)
    
290,234
      
(16,148
)
    
858,139
      
(53,074
)
Total fixed maturity securities
  
$
2,445,326
    
$
(109,516
)
  
$
1,525,865
    
$
(47,549
)
  
$
3,971,191
    
$
(157,065
)
Equity securities
    
50,285
      
(4,068
)
    
73,994
      
(7,879
)
    
124,279
      
(11,947
)
Total
  
$
2,495,611
    
$
(113,584
)
  
$
1,599,859
    
$
(55,428
)
  
$
4,095,470
    
$
(169,012
)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity
   
Duration of Unrealized Loss at September 30, 2015 By Maturity
   
Less than 12 months
  
Greater than 12 months
  
Total
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities
                        
Due in one year or less
  
$
85,547
    
$
(4,021
)
  
$
83,375
    
$
(12,950
)
  
$
168,922
    
$
(16,971
)
Due in one year through five years
    
1,220,223
      
(50,689
)
    
577,851
      
(41,640
)
    
1,798,074
      
(92,329
)
Due in five years through ten years
    
924,605
      
(51,295
)
    
208,989
      
(20,624
)
    
1,133,594
      
(71,919
)
Due after ten years
    
111,635
      
(8,439
)
    
54,693
      
(5,448
)
    
166,328
      
(13,887
)
Asset-backed securities
    
89,526
      
(674
)
    
44,765
      
(880
)
    
134,291
      
(1,554
)
Mortgage-backed securities
    
387,940
      
(2,979
)
    
382,774
      
(4,027
)
    
770,714
      
(7,006
)
Total fixed maturity securities
  
$
2,819,476
    
$
(118,097
)
  
$
1,352,447
    
$
(85,569
)
  
$
4,171,923
    
$
(203,666
)

   
Duration of Unrealized Loss at December 31, 2014 By Maturity
   
Less than 12 months
  
Greater than 12 months
  
Total
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities
                        
Due in one year or less
  
$
98,021
    
$
(5,166
)
  
$
80,002
    
$
(8,174
)
  
$
178,023
    
$
(13,340
)
Due in one year through five years
    
1,233,244
      
(68,124
)
    
518,613
      
(12,761
)
    
1,751,857
      
(80,885
)
Due in five years through ten years
    
679,374
      
(28,529
)
    
187,717
      
(10,734
)
    
867,091
      
(39,263
)
Due after ten years
    
72,436
      
(6,172
)
    
50,518
      
(4,116
)
    
122,954
      
(10,288
)
Asset-backed securities
    
192,253
      
(1,230
)
    
-
      
-
      
192,253
      
(1,230
)
Mortgage-backed securities
    
169,998
      
(295
)
    
689,015
      
(11,764
)
    
859,013
      
(12,059
)
Total fixed maturity securities
  
$
2,445,326
    
$
(109,516
)
  
$
1,525,865
    
$
(47,549
)
  
$
3,971,191
    
$
(157,065
)
Summary Of Components Of Net Investment Income
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
(Dollars in thousands)
  
2015
    
2014
    
2015
    
2014
  
Fixed maturities
  
$
108,134
    
$
115,057
    
$
326,970
    
$
348,872
  
Equity securities
    
11,090
      
11,086
      
35,783
      
36,111
  
Short-term investments and cash
    
381
      
295
      
1,084
      
1,202
  
Other invested assets
                                
Limited partnerships
    
370
      
21,690
      
13,993
      
25,658
  
Other
    
(242
)
    
869
      
1,366
      
3,220
  
Gross investment income before adjustments
    
119,733
      
148,997
      
379,196
      
415,063
  
Funds held interest income (expense)
    
2,569
      
1,817
      
8,162
      
6,875
  
Future policy benefit reserve income (expense)
    
(300
)
    
(471
)
    
(1,402
)
    
(915
)
Gross investment income
    
122,002
      
150,343
      
385,956
      
421,023
  
Investment expenses
    
(6,491
)
    
(8,200
)
    
(22,816
)
    
(24,499
)
Net investment income
  
$
115,511
    
$
142,143
    
$
363,140
    
$
396,524
  
Summary Of Components Of Net Realized Capital Gains (Losses)
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
(Dollars in thousands)
  
2015
    
2014
    
2015
    
2014
  
Fixed maturity securities, market value:
                
Other-than-temporary impairments
  
$
(20,445
)
  
$
(106
)
  
$
(62,701
)
  
$
(495
)
Gains (losses) from sales
    
(5,218
)
    
7,311
      
(15,812
)
    
3,668
  
Fixed maturity securities, fair value:
                                
Gains (losses) from sales
    
(17
)
    
82
      
25
      
1,022
  
Gains (losses) from fair value adjustments
    
-
      
(938
)
    
56
      
(938
)
Equity securities, market value:
                                
Gains (losses) from sales
    
(3,573
)
    
(181
)
    
(4,455
)
    
(1,235
)
Equity securities, fair value:
                                
Gains (losses) from sales
    
(13,646
)
    
(1,823
)
    
(13,041
)
    
(1,873
)
Gains (losses) from fair value adjustments
    
(117,087
)
    
(13,792
)
    
(98,741
)
    
70,548
  
Short-term investments gains (losses)
    
15
      
(1
)
    
15
      
(3
)
Total net realized capital gains (losses)
  
$
(159,971
)
  
$
(9,448
)
  
$
(194,654
)
  
$
70,694
  
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
(Dollars in thousands)
  
2015
    
2014
    
2015
    
2014
  
Proceeds from sales of fixed maturity securities
  
$
414,538
    
$
446,699
    
$
1,147,824
    
$
1,073,938
  
Gross gains from sales
    
11,826
      
12,821
      
37,525
      
28,828
  
Gross losses from sales
    
(17,061
)
    
(5,428
)
    
(53,312
)
    
(24,138
)
                                 
Proceeds from sales of equity securities
  
$
156,593
    
$
150,124
    
$
461,812
    
$
463,688
  
Gross gains from sales
    
5,250
      
2,545
      
18,890
      
13,047
  
Gross losses from sales
    
(22,469
)
    
(4,549
)
    
(36,386
)
    
(16,155
)