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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cost or Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI of Fixed Maturity and Equity Securities
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
$
1,859

 
$
194

 
$
—

 
$
2,053

 
$
—

States, municipalities and political
subdivisions
36,850

 
1,890

 
—

 
38,740

 
—

Foreign governments
14,567

 
2,644

 
—

 
17,211

 
—

Asset-backed
575

 
37

 
—

 
612

 
—

Commercial mortgage-backed
1,064

 
15

 
—

 
1,079

 
—

Residential mortgage-backed
64,917

 
6,133

 
(100
)
 
70,950

 
2,346

Corporate
2,052,845

 
283,686

 
(20,255
)
 
2,316,276

 
11,972

Total fixed maturity securities
$
2,172,677

 
$
294,599

 
$
(20,355
)
 
$
2,446,921

 
$
14,318

Equity securities:
 
 
 
 
 
 
 
 
 
Common stocks
$
92

 
$
361

 
$
—

 
$
453

 
$
—

Non-redeemable preferred stocks
144,315

 
13,783

 
(469
)
 
157,629

 
—

Total equity securities
$
144,407

 
$
14,144

 
$
(469
)
 
$
158,082

 
$
—

 
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
$
19,221

 
$
255

 
$
(1
)
 
$
19,475

 
$
—

States, municipalities and political
subdivisions
42,745

 
3,043

 
—

 
45,788

 
—

Foreign governments
19,061

 
2,763

 
—

 
21,824

 
—

Asset-backed
684

 
50

 
—

 
734

 
—

Commercial mortgage-backed
3,794

 
102

 
—

 
3,896

 
—

Residential mortgage-backed
65,090

 
6,948

 
(12
)
 
72,026

 
2,386

Corporate
2,099,296

 
418,393

 
(2,744
)
 
2,514,945

 
13,455

Total fixed maturity securities
$
2,249,891

 
$
431,554

 
$
(2,757
)
 
$
2,678,688

 
$
15,841

Equity securities:
 
 
 
 
 
 
 
 
 
Common stocks
$
92

 
$
322

 
$
—

 
$
414

 
$
—

Non-redeemable preferred stocks
122,255

 
13,350

 
(273
)
 
135,332

 
—

Total equity securities
$
122,347

 
$
13,672

 
$
(273
)
 
$
135,746

 
$
—

(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.
Schedule of Cost or 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
$
30,471

 
$
30,727

Due after one year through five years
352,473

 
378,898

Due after five years through ten years
339,463

 
351,174

Due after ten years
1,383,714

 
1,613,481

Total
2,106,121

 
2,374,280

Asset-backed
575

 
612

Commercial mortgage-backed
1,064

 
1,079

Residential mortgage-backed
64,917

 
70,950

Total
$
2,172,677

 
$
2,446,921
Schedule of Major Categories of Net Investment Income
Major categories of net investment income were as follows:
 
Years Ended December 31,
 
2015
 
2014
 
2013
Fixed maturity securities
$
129,980

 
$
136,005

 
$
143,493

Equity securities
9,139

 
6,932

 
5,984

Commercial mortgage loans on real estate
30,417

 
33,403

 
36,336

Policy loans
529

 
778

 
802

Short-term investments
39

 
9

 
22

Other investments
5,266

 
10,617

 
3,580

Cash and cash equivalents
3

 
4

 
1

Total investment income
175,373

 
187,748

 
190,218

Investment expenses
(5,920
)
 
(7,014
)
 
(7,258
)
Net investment income
$
169,453

 
$
180,734

 
$
182,960
Summary of 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
$
312,031

 
$
294,502

 
$
438,984

Gross realized gains
9,733

 
16,833

 
23,898

Gross realized losses
4,284

 
1,083

 
11,173
Schedule of 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
$
3,164

 
$
16,820

 
$
4,554

Equity securities
1,791

 
(328
)
 
8,793

Commercial mortgage loans on real estate
390

 
32

 
1,599

Other investments
11,699

 
(159
)
 
(1,457
)
Total net realized gains related to sales and other
17,044

 
16,365

 
13,489

Net realized losses related to other-than-temporary impairments:
 
 
 
 
 
Fixed maturity securities
(2,382
)
 
(24
)
 
(1,865
)
Other investments
(4,641
)
 
—

 
—

Total net realized losses related to other-than-temporary impairments
(7,023
)
 
(24
)
 
(1,865
)
Total net realized gains
$
10,021

 
$
16,341

 
$
11,624
Schedule of Credit Loss Impairments on Fixed Maturity Securities for Which a Portion of the OTTI Loss was Recognized in AOCI
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
$
13,467

 
$
14,164

 
$
26,970

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

 
24

 
87

Additions for credit loss impairments recognized in the current period on
 securities not previously impaired
763

 
—

 
—

Reductions for increases in cash flows expected to be collected that are
 recognized over the remaining life of the security
(224
)
 
(461
)
 
(123
)
Reductions for credit loss impairments previously recognized on securities
 which matured, paid down, prepaid or were sold during the period
(367
)
 
(260
)
 
(12,770
)
Balance, end of year
$
13,639

 
$
13,467

 
$
14,164
Schedule 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:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed
5,820

 
(91
)
 
522

 
(9
)
 
6,342

 
(100
)
Corporate
282,972

 
(18,325
)
 
10,838

 
(1,930
)
 
293,810

 
(20,255
)
Total fixed maturity securities
$
288,792

 
$
(18,416
)
 
$
11,360

 
$
(1,939
)
 
$
300,152

 
$
(20,355
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Non-redeemable preferred stocks
$
16,307

 
$
(330
)
 
$
4,573

 
$
(139
)
 
$
20,880

 
$
(469
)
 
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
$
1,889

 
$
(1
)
 
$
—

 
$
—

 
$
1,889

 
$
(1
)
Residential mortgage-backed
—

 
—

 
526

 
(12
)
 
526

 
(12
)
Corporate
98,644

 
(2,327
)
 
5,295

 
(417
)
 
103,939

 
(2,744
)
Total fixed maturity securities
$
100,533

 
$
(2,328
)
 
$
5,821

 
$
(429
)
 
$
106,354

 
$
(2,757
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Non-redeemable preferred stocks
$
1,417

 
$
(14
)
 
$
4,454

 
$
(259
)
 
$
5,871

 
$
(273
)
Schedule of Cost or Amortized Cost and Fair Value of Available-For-Sale Fixed Maturity Securities in an Unrealized Loss Position
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 after one year or less
$
4,439

 
$
4,429

Due after one year through five years
26,769

 
25,595

Due after five years through ten years
139,913

 
134,975

Due after ten years
142,944

 
128,811

Total
314,065

 
293,810

Residential mortgage-backed
6,442

 
6,342

Total
$
320,507

 
$
300,152
Summary of Loan-To-Value and Average Debt-Service Coverage Ratios
The following summarizes our 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
 
$
399,321

 
94.7
%
 
1.98

71 - 80%
 
11,590

 
2.8
%
 
1.25

81 - 95%
 
5,916

 
1.4
%
 
0.92

Greater than 95%
 
4,816

 
1.1
%
 
3.52

Gross commercial mortgage loans on real estate
 
421,643

 
100.0
%
 
1.96

Less valuation allowance
 
(1,074
)
 
 

 
 

Net commercial mortgage loans on real estate
 
$
420,569

 
 

 
 

 
 
December 31, 2014
Loan-to-Value
 
Carrying
Value
 
% of
 Gross
Mortgage
Loans
 
Debt-
Service
Coverage
 Ratio
70% and less
 
$
447,941

 
89.4
%
 
1.99

71 - 80%
 
40,651

 
8.1
%
 
1.28

81 - 95%
 
6,155

 
1.2
%
 
0.99

Greater than 95%
 
6,531

 
1.3
%
 
0.43

Gross commercial mortgage loans on real estate
 
501,278

 
100.0
%
 
1.90

Less valuation allowance
 
(1,464
)
 
 

 
 

Net commercial mortgage loans on real estate
 
$
499,814