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Investments (Tables)
 6 Months Ended
Jun. 30, 2017
Investments [Abstract]  
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments
At June 30, 2017
  
   
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
  
$
667,000
    
$
2,961
    
$
(3,184
)
  
$
666,777
    
$
-
  
Obligations of U.S. states and political subdivisions
    
679,940
      
22,970
      
(6,127
)
    
696,783
      
-
  
Corporate securities
    
2,274,212
      
40,765
      
(13,976
)
    
2,301,001
      
908
  
Asset-backed securities
    
189,598
      
433
      
(42
)
    
189,989
      
-
  
Mortgage-backed securities
                                        
Commercial
    
73,127
      
507
      
(389
)
    
73,245
      
-
  
Agency residential
    
688,735
      
2,163
      
(7,217
)
    
683,681
      
-
  
Non-agency residential
    
61
      
9
      
-
      
70
      
-
  
Foreign government securities
    
489,750
      
20,205
      
(8,568
)
    
501,387
      
-
  
Foreign corporate securities
    
1,009,145
      
28,358
      
(10,408
)
    
1,027,095
      
319
  
Total fixed maturity securities
  
$
6,071,568
    
$
118,371
    
$
(49,911
)
  
$
6,140,028
    
$
1,227
  
 
   
At December 31, 2016
  
   
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
  
$
693,005
    
$
2,509
    
$
(4,434
)
  
$
691,080
    
$
-
  
Obligations of U.S. states and political subdivisions
    
723,938
      
18,016
      
(11,970
)
    
729,984
      
-
  
Corporate securities
    
2,119,324
      
50,665
      
(15,786
)
    
2,154,203
      
4,868
  
Asset-backed securities
    
136,826
      
330
      
(129
)
    
137,027
      
-
  
Mortgage-backed securities
                                        
Commercial
    
75,435
      
510
      
(452
)
    
75,493
      
-
  
Agency residential
    
721,772
      
2,365
      
(8,993
)
    
715,144
      
-
  
Non-agency residential
    
76
      
12
      
-
      
88
      
-
  
Foreign government securities
    
495,572
      
22,088
      
(10,383
)
    
507,277
      
-
  
Foreign corporate securities
    
944,546
      
30,015
      
(14,361
)
    
960,200
      
175
  
Total fixed maturity securities
  
$
5,910,494
    
$
126,510
    
$
(66,508
)
  
$
5,970,496
    
$
5,043
  
 
(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 June 30, 2017
    
At December 31, 2016
  
   
Amortized
    
Market
    
Amortized
    
Market
  
(Dollars in thousands)
  
Cost
    
Value
    
Cost
    
Value
  
Fixed maturity securities – available for sale
                        
    Due in one year or less
  
$
438,873
    
$
439,218
    
$
394,401
    
$
392,824
  
    Due after one year through five years
    
2,912,173
      
2,932,487
      
2,925,786
      
2,955,325
  
    Due after five years through ten years
    
1,043,485
      
1,063,492
      
879,762
      
894,166
  
    Due after ten years
    
725,516
      
757,846
      
776,436
      
800,429
  
Asset-backed securities
    
189,598
      
189,989
      
136,826
      
137,027
  
Mortgage-backed securities
                                
Commercial
    
73,127
      
73,245
      
75,435
      
75,493
  
Agency residential
    
688,735
      
683,681
      
721,772
      
715,144
  
Non-agency residential
    
61
      
70
      
76
      
88
  
Total fixed maturity securities
  
$
6,071,568
    
$
6,140,028
    
$
5,910,494
    
$
5,970,496
  
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
(Dollars in thousands)
  
2017
    
2016
    
2017
    
2016
  
Increase (decrease) during the period between the market value and cost
                        
of investments carried at market value, and deferred taxes thereon:
                        
Fixed maturity securities
  
$
32
    
$
53,863
    
$
12,274
    
$
123,689
  
Fixed maturity securities, other-than-temporary impairment
    
(317
)
    
6,446
      
(3,816
)
    
6,643
  
Other invested assets
    
821
      
-
      
1,265
      
-
  
Change in unrealized  appreciation (depreciation), pre-tax
    
536
      
60,309
      
9,723
      
130,332
  
Deferred tax benefit (expense)
    
(299
)
    
(18,852
)
    
(4,739
)
    
(43,291
)
Deferred tax benefit (expense), other-than-temporary impairment
    
111
      
(2,256
)
    
1,336
      
(2,325
)
Change in unrealized appreciation (depreciation),
                                
net of deferred taxes, included in stockholder's equity
  
$
348
    
$
39,201
    
$
6,320
    
$
84,716
  
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type
Duration of Unrealized Loss at June 30, 2017 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
  
$
261,624
    
$
(3,184
)
  
$
-
    
$
-
    
$
261,624
    
$
(3,184
)
Obligations of U.S. states and political subdivisions
    
157,890
      
(6,127
)
    
-
      
-
      
157,890
      
(6,127
)
Corporate securities
    
528,750
      
(10,097
)
    
68,699
      
(3,879
)
    
597,449
      
(13,976
)
Asset-backed securities
    
56,504
      
(39
)
    
2,525
      
(3
)
    
59,029
      
(42
)
Mortgage-backed securities
                                                
Commercial
    
13,797
      
(317
)
    
2,991
      
(72
)
    
16,788
      
(389
)
Agency residential
    
445,347
      
(5,091
)
    
82,351
      
(2,126
)
    
527,698
      
(7,217
)
Non-agency residential
    
-
      
-
      
-
      
-
      
-
      
-
  
Foreign government securities
    
177,440
      
(2,308
)
    
56,133
      
(6,260
)
    
233,573
      
(8,568
)
Foreign corporate securities
    
201,847
      
(2,108
)
    
73,620
      
(8,300
)
    
275,467
      
(10,408
)
Total fixed maturity securities
  
$
1,843,199
    
$
(29,271
)
  
$
286,319
    
$
(20,640
)
  
$
2,129,518
    
$
(49,911
)

 

Duration of Unrealized Loss at December 31, 2016 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
  
$
469,571
    
$
(4,434
)
  
$
-
    
$
-
    
$
469,571
    
$
(4,434
)
Obligations of U.S. states and political subdivisions
    
221,088
      
(11,486
)
    
564
      
(484
)
    
221,652
      
(11,970
)
Corporate securities
    
431,757
      
(10,121
)
    
118,172
      
(5,665
)
    
549,929
      
(15,786
)
Asset-backed securities
    
35,065
      
(122
)
    
5,745
      
(7
)
    
40,810
      
(129
)
Mortgage-backed securities
                                                
Commercial
    
27,230
      
(391
)
    
3,060
      
(61
)
    
30,290
      
(452
)
Agency residential
    
487,000
      
(6,320
)
    
90,740
      
(2,673
)
    
577,740
      
(8,993
)
Non-agency residential
    
-
      
-
      
-
      
-
      
-
      
-
  
Foreign government securities
    
218,171
      
(2,713
)
    
61,542
      
(7,670
)
    
279,713
      
(10,383
)
Foreign corporate securities
    
264,939
      
(4,950
)
    
75,489
      
(9,411
)
    
340,428
      
(14,361
)
Total fixed maturity securities
  
$
2,154,821
    
$
(40,537
)
  
$
355,312
    
$
(25,971
)
  
$
2,510,133
    
$
(66,508
)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity
Duration of Unrealized Loss at June 30, 2017 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
  
$
157,063
    
$
(277
)
  
$
18,588
    
$
(3,005
)
  
$
175,651
    
$
(3,282
)
Due in one year through five years
    
709,510
      
(9,577
)
    
147,334
      
(13,549
)
    
856,844
      
(23,126
)
Due in five years through ten years
    
297,303
      
(7,601
)
    
32,309
      
(1,879
)
    
329,612
      
(9,480
)
Due after ten years
    
163,675
      
(6,369
)
    
221
      
(6
)
    
163,896
      
(6,375
)
Asset-backed securities
    
56,504
      
(39
)
    
2,525
      
(3
)
    
59,029
      
(42
)
Mortgage-backed securities
    
459,144
      
(5,408
)
    
85,342
      
(2,198
)
    
544,486
      
(7,606
)
Total fixed maturity securities
  
$
1,843,199
    
$
(29,271
)
  
$
286,319
    
$
(20,640
)
  
$
2,129,518
    
$
(49,911
)

 

Duration of Unrealized Loss at December 31, 2016 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
  
$
111,926
    
$
(322
)
  
$
21,691
    
$
(3,625
)
  
$
133,617
    
$
(3,947
)
Due in one year through five years
    
1,015,066
      
(10,567
)
    
190,960
      
(16,511
)
    
1,206,026
      
(27,078
)
Due in five years through ten years
    
243,082
      
(10,369
)
    
41,371
      
(2,961
)
    
284,453
      
(13,330
)
Due after ten years
    
235,452
      
(12,446
)
    
1,745
      
(133
)
    
237,197
      
(12,579
)
Asset-backed securities
    
35,065
      
(122
)
    
5,745
      
(7
)
    
40,810
      
(129
)
Mortgage-backed securities
    
514,230
      
(6,711
)
    
93,800
      
(2,734
)
    
608,030
      
(9,445
)
Total fixed maturity securities
  
$
2,154,821
    
$
(40,537
)
  
$
355,312
    
$
(25,971
)
  
$
2,510,133
    
$
(66,508
)
Summary Of Components Of Net Investment Income
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
(Dollars in thousands)
  
2017
    
2016
    
2017
    
2016
  
Fixed maturities
  
$
49,601
    
$
44,795
    
$
96,581
    
$
90,121
  
Equity securities
    
6,370
      
8,734
      
13,118
      
17,882
  
Short-term investments and cash
    
590
      
251
      
980
      
555
  
Other invested assets
                                
Limited partnerships
    
8,978
      
14,192
      
8,754
      
11,678
  
Dividends from preferred shares of affiliate
    
7,758
      
7,758
      
15,516
      
15,516
  
Other
    
1,496
      
729
      
2,748
      
(183
)
Gross investment income before adjustments
    
74,793
      
76,459
      
137,697
      
135,569
  
Funds held interest income (expense)
    
978
      
974
      
2,917
      
3,628
  
Interest income from Parent
    
1,075
      
1,075
      
2,150
      
2,150
  
Gross investment income
    
76,846
      
78,508
      
142,764
      
141,347
  
Investment expenses
    
(4,946
)
    
(4,636
)
    
(10,015
)
    
(9,030
)
Net investment income
  
$
71,900
    
$
73,872
    
$
132,749
    
$
132,317
  
                                 
(Some amounts may not reconcile due to rounding.)
                                
Summary Of Components Of Net Realized Capital Gains (Losses)
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
(Dollars in thousands)
  
2017
    
2016
    
2017
    
2016
  
Fixed maturity securities, market value:
                        
Other-than-temporary impairments
  
$
(1,574
)
  
$
(1,391
)
  
$
(2,706
)
  
$
(24,406
)
Gains (losses) from sales
    
6,507
      
2,244
      
12,972
      
(14,611
)
Fixed maturity securities, fair value:
                                
Gain (losses) from sales
    
-
      
(1,854
)
    
-
      
(1,854
)
Gains (losses) from fair value adjustments
    
-
      
1,571
      
-
      
1,339
  
Equity securities, fair value:
                                
Gains (losses) from sales
    
604
      
(7,636
)
    
4,944
      
(15,586
)
Gains (losses) from fair value adjustments
    
14,943
      
36,987
      
52,361
      
18,662
  
Other invested assets
    
(2
)
    
-
      
(1
)
    
-
  
Other invested assets, fair value:
                                
Gains (losses) from fair value adjustments
    
(112,769
)
    
(756
)
    
(42,094
)
    
(756
)
Short-term investment gains (losses)
    
-
      
-
      
1
      
-
  
Total net realized capital gains (losses)
  
$
(92,291
)
  
$
29,165
    
$
25,477
    
$
(37,212
)
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
(Dollars in thousands)
  
2017
    
2016
    
2017
    
2016
  
Proceeds from sales of fixed maturity securities
  
$
359,496
    
$
110,429
    
$
652,490
    
$
298,475
  
Gross gains from sales
    
7,748
      
6,154
      
15,743
      
7,618
  
Gross losses from sales
    
(1,241
)
    
(5,764
)
    
(2,771
)
    
(24,083
)
                                 
Proceeds from sales of equity securities
  
$
115,602
    
$
335,831
    
$
249,653
    
$
421,980
  
Gross gains from sales
    
3,562
      
4,853
      
11,575
      
6,635
  
Gross losses from sales
    
(2,958
)
    
(12,489
)
    
(6,631
)
    
(22,221
)