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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains And Losses, Fair Value And OTTI
The following tables show the cost or amortized cost, gross unrealized gains and losses, fair value and other-than-temporary impairment ("OTTI") of the Company's fixed maturity and equity securities as of the dates indicated:
 
December 31, 2015
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
OTTI
in AOCI  (a)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
United States Government and
  government agencies and authorities
$
150,681

 
$
3,891

 
$
(537
)
 
$
154,035

 
$
—

States, municipalities and political
  subdivisions
647,335

 
48,389

 
(94
)
 
695,630

 
—

Foreign governments
497,785

 
65,188

 
(723
)
 
562,250

 
—

Asset-backed
3,499

 
1,367

 
(204
)
 
4,662

 
1,285

Commercial mortgage-backed
22,169

 
352

 
—

 
22,521

 
—

Residential mortgage-backed
953,247

 
48,676

 
(3,409
)
 
998,514

 
15,343

Corporate
7,196,079

 
677,549

 
(95,912
)
 
7,777,716

 
17,885

Total fixed maturity securities
$
9,470,795

 
$
845,412

 
$
(100,879
)
 
$
10,215,328

 
$
34,513

Equity securities:
 
 
 
 
 
 
 
 
 
Common stocks
$
13,048

 
$
6,623

 
$
(7
)
 
$
19,664

 
$
—

Non-redeemable preferred stocks
437,515

 
45,495

 
(2,617
)
 
480,393

 
—

Total equity securities
$
450,563

 
$
52,118

 
$
(2,624
)
 
$
500,057

 
$
—

 
 
December 31, 2014
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
OTTI in
AOCI (a)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
United States Government and
  government agencies and authorities
$
172,070

 
$
5,201

 
$
(429
)
 
$
176,842

 
$
—

States, municipalities and political
  subdivisions
703,167

 
67,027

 
(353
)
 
769,841

 
—

Foreign governments
591,981

 
74,339

 
(1,457
)
 
664,863

 
—

Asset-backed
3,917

 
1,680

 
(78
)
 
5,519

 
1,570

Commercial mortgage-backed
44,907

 
1,109

 
—

 
46,016

 
—

Residential mortgage-backed
911,004

 
58,876

 
(1,154
)
 
968,726

 
17,732

Corporate
7,621,054

 
1,026,927

 
(16,614
)
 
8,631,367

 
21,612

Total fixed maturity securities
$
10,048,100

 
$
1,235,159

 
$
(20,085
)
 
$
11,263,174

 
$
40,914

Equity securities:
 
 
 
 
 
 
 
 
 
Common stocks
$
22,300

 
$
15,651

 
$
(1
)
 
$
37,950

 
$
—

Non-redeemable preferred stocks
412,575

 
50,975

 
(2,093
)
 
461,457

 
—

Total equity securities
$
434,875

 
$
66,626

 
$
(2,094
)
 
$
499,407

 
$
—

(a)
Represents the amount of OTTI recognized in accumulated other comprehensive income ("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.
Amortized Cost And Fair Value Of Fixed Maturity Securities By Contractual Maturity
The cost or amortized cost and fair value of fixed maturity securities at December 31, 2015 by contractual maturity are shown below. Expected maturities may differ from contractual maturities because issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. 
 
Cost or
Amortized
Cost
 
Fair Value
Due in one year or less
$
324,097

 
$
327,824

Due after one year through five years
1,904,357

 
1,984,818

Due after five years through ten years
2,121,934

 
2,171,426

Due after ten years
4,141,492

 
4,705,563

Total
8,491,880

 
9,189,631

Asset-backed
3,499

 
4,662

Commercial mortgage-backed
22,169

 
22,521

Residential mortgage-backed
953,247

 
998,514

Total
$
9,470,795

 
$
10,215,328
Categories Of Net Investment Income
Major categories of net investment income were as follows:
 
Years Ended December 31,
 
2015
 
2014
 
2013
Fixed maturity securities
$
486,165

 
$
522,309

 
$
530,144

Equity securities
29,957

 
28,014

 
27,013

Commercial mortgage loans on real estate
72,658

 
73,959

 
76,665

Policy loans
2,478

 
2,939

 
3,426

Short-term investments
2,033

 
1,950

 
2,156

Other investments
37,759

 
34,527

 
20,573

Cash and cash equivalents
18,416

 
18,556

 
14,679

Total investment income
649,466

 
682,254

 
674,656

Investment expenses
(23,249
)
 
(25,825
)
 
(24,360
)
Net investment income
$
626,217

 
$
656,429

 
$
650,296
Proceeds From Sales Of Available-For-Sale Securities And The Gross Realized Gains And Gross Realized Losses
The following table summarizes the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
Proceeds from sales
$
2,568,166

 
$
1,995,368

 
$
2,821,177

Gross realized gains
65,097

 
69,184

 
81,921

Gross realized losses
31,657

 
10,681

 
50,667
Net Realized Gains (Losses), Including Other-Than-Temporary Impairments
The following table sets forth the net realized gains (losses), including other-than-temporary impairments, recognized in the statement of operations as follows:
 
Years Ended December 31,
 
2015
 
2014
 
2013
Net realized gains (losses) related to sales and other:
 
 
 
 
 
Fixed maturity securities
$
13,322

 
$
54,200

 
$
14,579

Equity securities
19,016

 
6,190

 
19,789

Commercial mortgage loans on real estate
817

 
532

 
2,515

Other investments
3,695

 
(109
)
 
2,029

Total net realized gains related to sales and other
36,850

 
60,813

 
38,912

Net realized losses related to other-than-temporary impairments:
 
 
 
 
 
Fixed maturity securities
(5,024
)
 
(30
)
 
(3,295
)
Other investments
—

 
—

 
(1,092
)
Total net realized losses related to other-than-temporary impairments
(5,024
)
 
(30
)
 
(4,387
)
Total net realized gains
$
31,826

 
$
60,783

 
$
34,525
Credit Loss Impairments Recognized
The following table sets forth the amount of credit loss impairments recognized within the results of operations on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts.
 
Years Ended December 31,
 
2015
 
2014
 
2013
Balance, beginning of year
$
35,424

 
$
45,278

 
$
95,589

Additions for credit loss impairments recognized in the current period
  on securities previously impaired
—

 
30

 
107

Additions for credit loss impairments recognized in the current period
  on securities not previously impaired
2,621

 
—

 
—

Reductions for increases in cash flows expected to be collected that are
  recognized over the remaining life of the security
(2,398
)
 
(5,248
)
 
(1,851
)
Reductions for credit loss impairments previously recognized on
  securities which matured, paid down, prepaid or were sold during the
  period
(3,270
)
 
(4,636
)
 
(48,567
)
Balance, end of year
$
32,377

 
$
35,424

 
$
45,278
Duration Of Gross Unrealized Losses On Fixed Maturity Securities And Equity Securities
The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities and equity securities at December 31, 2015 and 2014 were as follows:
 
December 31, 2015
 
Less than 12 months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government and
  government agencies and authorities
$
90,008

 
$
(465
)
 
$
5,564

 
$
(72
)
 
$
95,572

 
$
(537
)
States, municipalities and political
  subdivisions
6,881

 
(94
)
 
—

 
—

 
6,881

 
(94
)
Foreign governments
24,071

 
(347
)
 
22,239

 
(376
)
 
46,310

 
(723
)
Asset-backed
—

 
—

 
1,136

 
(204
)
 
1,136

 
(204
)
Residential mortgage-backed
260,620

 
(3,179
)
 
11,147

 
(230
)
 
271,767

 
(3,409
)
Corporate
1,636,457

 
(85,247
)
 
54,029

 
(10,665
)
 
1,690,486

 
(95,912
)
Total fixed maturity securities
$
2,018,037

 
$
(89,332
)
 
$
94,115

 
$
(11,547
)
 
$
2,112,152

 
$
(100,879
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Common stock
$
623

 
$
(7
)
 
$
—

 
$
—

 
$
623

 
$
(7
)
Non-redeemable preferred stocks
63,665

 
(1,632
)
 
13,806

 
(985
)
 
77,471

 
(2,617
)
Total equity securities
$
64,288

 
$
(1,639
)
 
$
13,806

 
$
(985
)
 
$
78,094

 
$
(2,624
)

 
December 31, 2014
 
Less than 12 months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government and
  government agencies and authorities
$
34,551

 
$
(188
)
 
$
21,488

 
$
(241
)
 
$
56,039

 
$
(429
)
States, municipalities and political
  subdivisions
3,050

 
(282
)
 
4,633

 
(71
)
 
7,683

 
(353
)
Foreign governments
19,886

 
(67
)
 
37,741

 
(1,390
)
 
57,627

 
(1,457
)
Asset-backed
—

 
—

 
1,348

 
(78
)
 
1,348

 
(78
)
Residential mortgage-backed
22,337

 
(71
)
 
61,682

 
(1,083
)
 
84,019

 
(1,154
)
Corporate
640,641

 
(13,132
)
 
113,918

 
(3,482
)
 
754,559

 
(16,614
)
Total fixed maturity securities
$
720,465

 
$
(13,740
)
 
$
240,810

 
$
(6,345
)
 
$
961,275

 
$
(20,085
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Common stock
$
—

 
$
—

 
$
196

 
$
(1
)
 
$
196

 
$
(1
)
Non-redeemable preferred stocks
8,844

 
(264
)
 
24,784

 
(1,829
)
 
33,628

 
(2,093
)
Total equity securities
$
8,844

 
$
(264
)
 
$
24,980

 
$
(1,830
)
 
$
33,824

 
$
(2,094
)
Amortized Cost And Fair Value Of Fixed Maturity Securities In An Unrealized Loss Position By Contractual Maturity
The cost or amortized cost and fair value of available-for-sale fixed maturity securities in an unrealized loss position at December 31, 2015, by contractual maturity, is shown below:
 
Cost or
Amortized
Cost
 
Fair Value
Due in one year or less
$
52,077

 
$
51,667

Due after one year through five years
469,320

 
459,930

Due after five years through ten years
754,402

 
720,632

Due after ten years
660,716

 
607,020

Total
1,936,515

 
1,839,249

Asset-backed
1,340

 
1,136

Residential mortgage-backed
275,176

 
271,767

Total
$
2,213,031

 
$
2,112,152
Credit Quality Indicators For Commercial Mortgage Loans
The following summarizes the Company's loan-to-value and average debt-service coverage ratios as of the dates indicated:
 
December 31, 2015
Loan-to-Value
Carrying
Value
 
% of Gross
Mortgage
Loans
 
Debt-Service
Coverage Ratio
70% and less
$
1,101,572

 
95.5
%
 
2.01

71 – 80%
39,080

 
3.4
%
 
1.19

81 – 95%
8,370

 
0.7
%
 
1.05

Greater than 95%
4,816

 
0.4
%
 
3.52

Gross commercial mortgage loans
1,153,838

 
100.0
%
 
1.98

Less valuation allowance
(2,582
)
 
 
 
 
Net commercial mortgage loans
$
1,151,256

 
 
 
 
 
 
December 31, 2014
Loan-to-Value
Carrying
Value
 
% of Gross
Mortgage
Loans
 
Debt-Service
Coverage Ratio
70% and less
$
1,168,454

 
91.6
%
 
2.01

71 – 80%
73,762

 
5.8
%
 
1.26

81 – 95%
27,268

 
2.1
%
 
1.04

Greater than 95%
6,531

 
0.5
%
 
0.43

Gross commercial mortgage loans
1,276,015

 
100.0
%
 
1.94

Less valuation allowance
(3,399
)
 
 
 
 
Net commercial mortgage loans
$
1,272,616