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Investments
12 Months Ended
Dec. 31, 2016
Investments [Abstract]  
Investments
INVESTMENTS

Fixed Maturities and Equity Securities

The following tables provide information relating to fixed maturities and equity securities (excluding investments classified as trading) as of the dates indicated:
 
 
December 31, 2016
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
OTTI
in AOCI(3)
 
 
(in thousands)
Fixed maturities, available-for-sale:
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities and obligations of U.S. government authorities and agencies
 
$
154,180

 
$
6,593

 
$
33

 
$
160,740

 
$
0

Obligations of U.S. states and their political subdivisions
 
618,447

 
14,592

 
6,553

 
626,486

 
0

Foreign government bonds
 
111,025

 
2,143

 
4,386

 
108,782

 
0

Public utilities
 
706,536

 
33,950

 
10,519

 
729,967

 
0

Redeemable preferred stock
 
4,136

 
834

 
156

 
4,814

 
0

All other U.S. public corporate securities
 
1,802,350

 
67,908

 
28,846

 
1,841,412

 
(215
)
All other U.S. private corporate securities
 
714,776

 
14,555

 
7,702

 
721,629

 
(236
)
All other foreign public corporate securities
 
216,428

 
7,371

 
4,127

 
219,672

 
0

All other foreign private corporate securities
 
577,761

 
4,866

 
33,455

 
549,172

 
0

Asset-backed securities(1)
 
184,414

 
5,164

 
562

 
189,016

 
(2,534
)
Commercial mortgage-backed securities
 
382,717

 
5,783

 
5,829

 
382,671

 
0

Residential mortgage-backed securities(2)
 
80,141

 
3,355

 
308

 
83,188

 
(274
)
Total fixed maturities, available-for-sale
 
$
5,552,911

 
$
167,114

 
$
102,476

 
$
5,617,549

 
$
(3,259
)
Equity securities, available-for-sale:
 
 
 
 
 
 
 
 
 
 
Common stocks:
 
 
 
 
 
 
 
 
 
 
Mutual funds
 
$
16,324

 
$
441

 
$
124

 
$
16,641

 
 
Public utilities
 
66

 
2

 
28

 
40

 
 
Industrial, miscellaneous & other
 
0

 
75

 
0

 
75

 
 
Total equity securities, available-for-sale
 
$
16,390

 
$
518

 
$
152

 
$
16,756

 
 

(1)
Includes credit-tranched securities collateralized by sub-prime mortgages, auto loans, credit cards, education loans and other asset types.
(2)
Includes publicly-traded agency pass-through securities and collateralized mortgage obligations.
(3)
Represents the amount of OTTI losses in AOCI, which were not included in earnings. Amount excludes $8 million of net unrealized gains on impaired available-for-sale securities relating to changes in the value of such securities subsequent to the impairment measurement date.
 
 
December 31, 2015
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
OTTI
in AOCI(3)
 
 
(in thousands)
Fixed maturities, available-for-sale:
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities and obligations of U.S. government authorities and agencies
 
$
87,107

 
$
7,170

 
$
228

 
$
94,049

 
$
0

Obligations of U.S. states and their political subdivisions
 
602,508

 
24,219

 
1,958

 
624,769

 
0

Foreign government bonds
 
70,107

 
3,094

 
2,791

 
70,410

 
0

Public utilities
 
790,038

 
30,862

 
18,402

 
802,498

 
0

Redeemable preferred stock
 
5,316

 
1,530

 
145

 
6,701

 
0

All other U.S. public corporate securities
 
2,138,358

 
81,905

 
61,142

 
2,159,121

 
(217
)
All other U.S. private corporate securities
 
1,085,345

 
26,299

 
13,963

 
1,097,681

 
0

All other foreign public corporate securities
 
270,063

 
8,230

 
6,508

 
271,785

 
0

All other foreign private corporate securities
 
784,283

 
9,933

 
42,528

 
751,688

 
0

Asset-backed securities(1)
 
431,578

 
6,203

 
2,650

 
435,131

 
(3,056
)
Commercial mortgage-backed securities
 
396,160

 
10,614

 
2,429

 
404,345

 
0

Residential mortgage-backed securities(2)
 
114,943

 
7,876

 
65

 
122,754

 
(690
)
Total fixed maturities, available-for-sale
 
$
6,775,806

 
$
217,935

 
$
152,809

 
$
6,840,932

 
$
(3,963
)
Equity securities, available-for-sale:
 
 
 
 
 
 
 
 
 
 
Common stocks:
 
 
 
 
 
 
 
 
 
 
Mutual funds
 
$
54,543

 
$
256

 
$
3,030

 
$
51,769

 
 
Public utilities
 
66

 
2

 
29

 
39

 
 
Industrial, miscellaneous & other
 
0

 
165

 
0

 
165

 
 
Total equity securities, available-for-sale
 
$
54,609

 
$
423

 
$
3,059

 
$
51,973

 
 


(1)
Includes credit-tranched securities collateralized by sub-prime mortgages, auto loans, credit cards, education loans and other asset types.
(2)
Includes publicly-traded agency pass-through securities and collateralized mortgage obligations.
(3)
Represents the amount of OTTI losses in AOCI, which were not included in earnings. Amount excludes $9 million of net unrealized gains on impaired available-for-sale securities relating to changes in the value of such securities subsequent to the impairment measurement date.

The following tables show the fair value and gross unrealized losses aggregated by investment category and length of time that individual fixed maturity securities and equity securities have been in a continuous unrealized loss position, at December 31 for the years indicated:
 
 
 
2016
 
 
Less than twelve months
 
Twelve months or more
 
Total
 
 
Fair Value  
 
Gross
  Unrealized  
Losses
 
Fair Value  
 
Gross
  Unrealized  
Losses
 
Fair Value  
 
Gross
  Unrealized  
Losses
 
 
(in thousands)
Fixed maturities, available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities and obligations of U.S. government authorities and agencies
 
$
603

 
$
33

 
$
0

 
$
0

 
$
603

 
$
33

Obligations of U.S. states and their political subdivisions
 
239,146

 
6,553

 
0

 
0

 
239,146

 
6,553

Foreign government bonds
 
81,074

 
4,055

 
1,690

 
331

 
82,764

 
4,386

Public utilities
 
207,226

 
7,847

 
21,394

 
2,672

 
228,620

 
10,519

Redeemable preferred stock
 
0

 
0

 
0

 
156

 
0

 
156

All other U.S. public corporate securities
 
568,763

 
20,695

 
73,575

 
8,151

 
642,338

 
28,846

All other U.S. private corporate securities
 
232,561

 
6,082

 
29,071

 
1,620

 
261,632

 
7,702

All other foreign public corporate securities
 
86,492

 
3,188

 
5,433

 
939

 
91,925

 
4,127

All other foreign private corporate securities
 
236,512

 
13,604

 
101,858

 
19,851

 
338,370

 
33,455

Asset-backed securities
 
37,355

 
492

 
49,346

 
70

 
86,701

 
562

Commercial mortgage-backed securities
 
191,674

 
5,827

 
947

 
2

 
192,621

 
5,829

Residential mortgage-backed securities
 
36,224

 
302

 
1,045

 
6

 
37,269

 
308

Total fixed maturities, available-for-sale
 
$
1,917,630

 
$
68,678

 
$
284,359

 
$
33,798

 
$
2,201,989

 
$
102,476

Equity securities, available-for-sale
 
$
0

 
$
0

 
$
2,965

 
$
152

 
$
2,965

 
$
152

 
 
2015
 
 
Less than twelve months
 
Twelve months or more
 
Total
 
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
 
(in thousands)
Fixed maturities, available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities and obligations of U.S. government authorities and agencies
 
$
5,985

 
$
228

 
$
0

 
$
0

 
$
5,985

 
$
228

Obligations of U.S. states and their political subdivisions
 
77,756

 
1,958

 
0

 
0

 
77,756

 
1,958

Foreign government bonds
 
44,854

 
1,940

 
1,813

 
851

 
46,667

 
2,791

Public utilities
 
323,086

 
13,151

 
26,094

 
5,251

 
349,180

 
18,402

Redeemable preferred stock
 
0

 
145

 
0

 
0

 
0

 
145

All other U.S. public corporate securities
 
802,158

 
49,343

 
61,110

 
11,799

 
863,268

 
61,142

All other U.S. private corporate securities
 
323,218

 
12,476

 
17,103

 
1,487

 
340,321

 
13,963

All other foreign public corporate securities
 
121,662

 
5,098

 
6,079

 
1,410

 
127,741

 
6,508

All other foreign private corporate securities
 
284,191

 
14,089

 
154,791

 
28,439

 
438,982

 
42,528

Asset-backed securities
 
249,084

 
1,565

 
93,675

 
1,085

 
342,759

 
2,650

Commercial mortgage-backed securities
 
129,765

 
2,350

 
4,221

 
79

 
133,986

 
2,429

Residential mortgage-backed securities
 
18,435

 
59

 
1,519

 
6

 
19,954

 
65

Total fixed maturities, available-for-sale
 
$
2,380,194

 
$
102,402

 
$
366,405

 
$
50,407

 
$
2,746,599

 
$
152,809

Equity securities, available-for-sale
 
$
35,869

 
$
2,339

 
$
9,281

 
$
720

 
$
45,150

 
$
3,059


The gross unrealized losses on fixed maturity securities at December 31, 2016 and 2015, were composed of $93.3 million and $133.6 million, respectively, related to high or highest quality securities based on the National Association of Insurance Commissioners (“NAIC”) or equivalent rating and $9.2 million and $19.2 million, respectively, related to other than high or highest quality securities based on NAIC or equivalent rating. At December 31, 2016, the $33.8 million of gross unrealized losses of twelve months or more was concentrated in the energy, finance and utility sectors of the Company’s corporate securities. At December 31, 2015, the $50.4 million of gross unrealized losses of twelve months or more was concentrated in the energy, consumer non-cyclical, utility and finance sectors of the Company’s corporate securities. In accordance with its policy described in Note 2, the Company concluded that an adjustment to earnings for OTTI for these securities was not warranted at December 31, 2016 or 2015. These conclusions were based on a detailed analysis of the underlying credit and cash flows on each security. The gross unrealized losses were primarily attributable to interest rate increases. At December 31, 2016, the Company did not intend to sell these securities, and it is not more likely than not that the Company will be required to sell these securities before the anticipated recovery of the remaining amortized cost basis.

At December 31, 2016, gross unrealized losses related to equity securities representing declines in value of greater than 20% were $0.0 million, all of which had been in that position for more than twelve months. At December 31, 2015, gross unrealized losses related to equity securities representing declines in value of greater than 20% were $0.0 million, none of which had been in that position for more than twelve months. In accordance with its policy described in Note 2, the Company concluded that an adjustment to earnings for OTTI for these equity securities was not warranted at either December 31, 2016 or 2015.

The amortized cost and fair value of fixed maturities by contractual maturities at December 31, 2016, were as follows:
 
 
 
Available-for-Sale
 
 
Amortized Cost
 
Fair Value
 
 
(in thousands)
Due in one year or less
 
$
222,580

 
$
220,785

Due after one year through five years
 
695,311

 
713,491

Due after five years through ten years
 
950,127

 
941,499

Due after ten years
 
3,037,621

 
3,086,899

Asset-backed securities
 
184,414

 
189,016

Commercial mortgage-backed securities
 
382,717

 
382,671

Residential mortgage-backed securities
 
80,141

 
83,188

Total fixed maturities, available-for-sale
 
$
5,552,911

 
$
5,617,549



Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Asset-backed, commercial mortgage-backed and residential mortgage-backed securities are shown separately in the table above as they are not due at a single maturity date.

The following table depicts the sources of fixed maturity and equity security proceeds and related investment gains (losses), as well as losses on impairments of both fixed maturities and equity securities for the years indicated:
 
 
2016
 
2015
 
2014
 
 
 
 
(in thousands)
 
 
Fixed maturities, available-for-sale:
 
 
 
 
 
 
Proceeds from sales(1)
 
$
833,562

 
$
171,589

 
$
245,618

Proceeds from maturities/repayments(1)
 
495,969

 
642,503

 
656,249

Gross investment gains from sales, prepayments and maturities
 
94,262

 
12,496

 
20,394

Gross investment losses from sales and maturities
 
(10,475
)
 
(1,528
)
 
(2,704
)
Equity securities, available-for-sale:
 
 
 
 
 
 
Proceeds from sales(2)
 
$
34,618

 
$
5,732

 
$
17,873

Gross investment gains from sales
 
363

 
400

 
1,085

Gross investment losses from sales
 
(1,933
)
 
0

 
0

Fixed maturity and equity security impairments:
 
 
 
 
 
 
Net writedowns for other-than-temporary impairment losses on fixed maturities recognized in earnings(3)
 
$
(17,677
)
 
$
(1,463
)
 
$
(127
)
Writedowns for impairments on equity securities
 
0

 
(3
)
 
0


(1)
Includes $(1.5) million, $0.4 million and $(5.8) million of non-cash related proceeds for the years ended December 31, 2016, 2015 and 2014, respectively.
(2)
Includes $(0.0) million and $0.0 million of non-cash related proceeds for the years ended December 31, 2015 and 2014. There were no non-cash related proceeds included for the year ended December 31, 2016.
(3)
Excludes the portion of OTTI recorded in OCI representing any difference between the fair value of the impaired debt security and the net present value of its projected future cash flows at the time of the impairment.

As discussed in Note 2, a portion of certain OTTI losses on fixed maturity securities is recognized in OCI. For these securities, the net amount recognized in earnings (“credit loss impairments”) represents the difference between the amortized cost of the security and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security prior to impairment. Any remaining difference between the fair value and amortized cost is recognized in OCI. The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in OCI, and the corresponding changes in such amounts: 
 
 
Year Ended December 31,
 
 
2016
 
2015
 
 
(in thousands)
Balance, beginning of period
 
$
7,041

 
$
8,729

Credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period
 
(1,294
)
 
(1,719
)
Credit loss impairments recognized in the current period on securities not previously impaired
 
522

 
0

Additional credit loss impairments recognized in the current period on securities previously impaired
 
6

 
71

Increases due to the passage of time on previously recorded credit losses
 
242

 
213

Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected
 
(339
)
 
(253
)
Assets transferred to parent and affiliates
 
(658
)
 
0

Balance, end of period
 
$
5,520

 
$
7,041



Trading Account Assets

The following table sets forth the composition of “Trading account assets” as of the dates indicated: 
 
 
December 31, 2016
 
December 31, 2015
 
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
 
(in thousands)
Fixed maturities
 
$
23,555

 
$
19,558

 
$
50,565

 
$
46,364

Equity securities
 
11,929

 
15,770

 
14,761

 
18,248

Total trading account assets
 
$
35,484

 
$
35,328

 
$
65,326

 
$
64,612



The net change in unrealized gains (losses) from trading account assets still held at period end, recorded within “Other income,” was $0.6 million, $(3.4) million and $(0.7) million during the years ended December 31, 2016, 2015 and 2014, respectively.

Commercial Mortgage and Other Loans

The Company’s commercial mortgage and other loans were comprised as follows, as of the dates indicated:
 
 
 
December 31, 2016
 
December 31, 2015
 
 
Amount
(in thousands)
 
% of
Total
 
Amount
(in thousands)
 
% of
Total
Commercial mortgage and agricultural property loans by property type:
 
 
 
 
 
 
 
 
Retail
 
$
243,225

 
21.1
%
 
$
440,767

 
26.7
%
Apartments/Multi-Family
 
318,667

 
27.7

 
445,379

 
27.0

Industrial
 
185,682

 
16.1

 
254,884

 
15.4

Office
 
161,980

 
14.1

 
226,332

 
13.6

Other
 
124,465

 
10.8

 
92,581

 
5.6

Hospitality
 
54,597

 
4.7

 
85,910

 
5.2

Total commercial mortgage loans
 
1,088,616

 
94.5

 
1,545,853

 
93.5

Agricultural property loans
 
63,323

 
5.5

 
106,623

 
6.5

Total commercial mortgage and agricultural property loans by property type
 
1,151,939

 
100.0
%
 
1,652,476

 
100.0
%
Valuation allowance
 
(1,558
)
 
 
 
(2,651
)
 
 
Total net commercial mortgage and agricultural property loans by property type
 
1,150,381

 
 
 
1,649,825

 
 
Other loans:
 
 
 
 
 
 
 
 
Uncollateralized loans
 
0

 
 
 
8,410

 
 
Valuation allowance
 
0

 
 
 
0

 
 
Total net other loans
 
0

 
 
 
8,410

 
 
Total commercial mortgage and other loans
 
$
1,150,381

 
 
 
$
1,658,235

 
 


The commercial mortgage and agricultural property loans were geographically dispersed throughout the United States (with the largest concentrations in California (23%), Texas (15%), and Illinois (7%)) and included loans secured by properties in Australia and Europe at December 31, 2016.

Activity in the allowance for credit losses for all commercial mortgage and other loans, as of the dates indicated, was as follows: 
 
 
December 31, 2016
 
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Other Loans
 
Total
 
 
(in thousands)
Allowance for credit losses, beginning of year
 
$
2,587

 
$
64

 
$
0

 
$
2,651

Addition to (release of) allowance for losses
 
(1,074
)
 
(19
)
 
0

 
(1,093
)
Charge-offs, net of recoveries
 
0

 
0

 
0

 
0

Total ending balance
 
$
1,513

 
$
45

 
$
0

 
$
1,558



 
 
December 31, 2015
 
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Other Loans
 
Total
 
 
(in thousands)
Allowance for credit losses, beginning of year
 
$
4,071

 
$
83

 
$
0

 
$
4,154

Addition to (release of) allowance for losses
 
(1,484
)
 
(19
)
 
0

 
(1,503
)
Charge-offs, net of recoveries
 
0

 
0

 
0

 
0

Total ending balance
 
$
2,587

 
$
64

 
$
0

 
$
2,651



The following tables set forth the allowance for credit losses and the recorded investment in commercial mortgage and other loans as of the dates indicated: 

 
 
December 31, 2016
 
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Other Loans
 
Total
 
 
(in thousands)
Allowance for Credit Losses:
 
 
 
 
 
 
 
 
Individually evaluated for impairment
 
$
0

 
$
0

 
$
0

 
$
0

Collectively evaluated for impairment
 
1,513

 
45

 
0

 
1,558

Loans acquired with deteriorated credit quality
 
0

 
0

 
0

 
0

Total ending balance
 
$
1,513

 
$
45

 
$
0

 
$
1,558

Recorded Investment(1):
 
 
 
 
 
 
 
 
Individually evaluated for impairment
 
$
2,528

 
$
0

 
$
0

 
$
2,528

Collectively evaluated for impairment
 
1,086,088

 
63,323

 
0

 
1,149,411

Loans acquired with deteriorated credit quality
 
0

 
0

 
0

 
0

Total ending balance
 
$
1,088,616

 
$
63,323

 
$
0

 
$
1,151,939

 
 
December 31, 2015
 
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Other Loans
 
Total
 
 
(in thousands)
Allowance for Credit Losses:
 
 
 
 
 
 
 
 
Individually evaluated for impairment
 
$
0

 
$
0

 
$
0

 
$
0

Collectively evaluated for impairment
 
2,587

 
64

 
0

 
2,651

Loans acquired with deteriorated credit quality
 
0

 
0

 
0

 
0

Total ending balance
 
$
2,587

 
$
64

 
$
0

 
$
2,651

Recorded Investment(1):
 
 
 
 
 
 
 
 
Individually evaluated for impairment
 
$
0

 
$
287

 
$
0

 
$
287

Collectively evaluated for impairment
 
1,545,853

 
106,336

 
8,410

 
1,660,599

Loans acquired with deteriorated credit quality
 
0

 
0

 
0

 
0

Total ending balance
 
$
1,545,853

 
$
106,623

 
$
8,410

 
$
1,660,886


(1)
Recorded investment reflects the carrying value gross of related allowance.

The following tables set forth certain key credit quality indicators for commercial mortgage and agricultural property loans, based upon the recorded investment gross of allowance for credit losses, as of the dates indicated:
 
 
Debt Service Coverage Ratio - December 31, 2016
 
 
> 1.2X
 
1.0X to <1.2X
 
Less than 1.0X
 
Total
 
 
(in thousands)
Loan-to-Value Ratio:
 
 
 
 
 
 
 
 
0%-59.99%
 
$
732,473

 
$
19,844

 
$
0

 
$
752,317

60%-69.99%
 
267,122

 
7,515

 
900

 
275,537

70%-79.99%
 
88,811

 
30,533

 
0

 
119,344

80% or greater
 
4,503

 
0

 
238

 
4,741

Total commercial mortgage and agricultural property loans
 
$
1,092,909

 
$
57,892

 
$
1,138

 
$
1,151,939

 
 
 
Debt Service Coverage Ratio - December 31, 2015
 
 
> 1.2X
 
1.0X to <1.2X
 
Less than 1.0X
 
Total
 
 
(in thousands)
Loan-to-Value Ratio:
 
 
 
 
 
 
 
 
0%-59.99%
 
$
1,004,751

 
$
35,579

 
$
6,762

 
$
1,047,092

60%-69.99%
 
378,799

 
4,969

 
4,016

 
387,784

70%-79.99%
 
197,208

 
12,471

 
0

 
209,679

80% or greater
 
0

 
2,938

 
4,983

 
7,921

Total commercial mortgage and agricultural property loans
 
$
1,580,758

 
$
55,957

 
$
15,761

 
$
1,652,476



The following tables provide an aging of past due commercial mortgage and other loans as of the dates indicated, based upon the recorded investment gross of allowance for credit losses, as well as the amount of commercial mortgage and other loans on non-accrual status as of the dates indicated:

 
 
December 31, 2016
 
 
Current
 
30-59 Days Past Due
 
60-89 Days Past Due
 
90 Days or More Past Due(1)
 
Total Loans
 
Non-Accrual Status
 
 
(in thousands)
Commercial mortgage loans
 
$
1,088,616

 
$
0

 
$
0

 
$
0

 
$
1,088,616

 
$
0

Agricultural property loans
 
63,323

 
0

 
0

 
0

 
63,323

 
0

Other loans
 
0

 
0

 
0

 
0

 
0

 
0

Total commercial mortgage and other loans
 
$
1,151,939

 
$
0

 
$
0

 
$
0

 
$
1,151,939

 
$
0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
 
Current
 
30-59 Days Past Due
 
60-89 Days Past Due
 
90 Days or More Past Due(1)
 
Total Loans
 
Non-Accrual Status
 
 
(in thousands)
Commercial mortgage loans
 
$
1,545,853

 
$
0

 
$
0

 
$
0

 
$
1,545,853

 
$
0

Agricultural property loans
 
106,336

 
287

 
0

 
0

 
106,623

 
0

Other loans
 
8,410

 
0

 
0

 
0

 
8,410

 
0

Total commercial mortgage and other loans
 
$
1,660,599

 
$
287

 
$
0

 
$
0

 
$
1,660,886

 
$
0


(1)
There were no loans accruing interest

See Note 2 for further discussion regarding non-accrual status loans.

For the years ended December 31, 2016 and 2015, there were no commercial mortgage or other loans acquired, other than those through direct origination, nor were there any commercial mortgage or other loans sold. For the year ended December 31, 2016, the Company transferred $631 million of commercial mortgage and other loans to related parties. See Note 1 for additional information.

The Company’s commercial mortgage and other loans may occasionally be involved in a troubled debt restructuring. As of both December 31, 2016 and 2015, the Company had no significant commitments to borrowers that have been involved in a troubled debt restructuring. For the years ended December 31, 2016 and 2015, there were no new troubled debt restructurings related to commercial mortgage or other loans and no payment defaults on commercial mortgage or other loans that were modified as a troubled debt restructuring within the 12 months preceding. See Note 2 for additional information relating to the accounting for troubled debt restructurings.

Other Long-Term Investments

The following table sets forth the composition of “Other long-term investments” at December 31 for the years indicated:
 
 
2016
 
2015
 
 
(in thousands)
Company's investment in separate accounts
 
$
34,088

 
$
28,567

Joint ventures and limited partnerships:
 
 
 
 
Private equity
 
139,493

 
140,310

Hedge funds
 
81,104

 
130,575

Real estate-related
 
11,912

 
9,685

Total joint ventures and limited partnerships
 
232,509

 
280,570

Derivatives
 
77,866

 
70,100

Total other long-term investments
 
$
344,463

 
$
379,237



As of both December 31, 2016 and 2015, the Company had no significant equity method investments.

Net Investment Income

The following table sets forth net investment income by asset class for the years ended December 31: 
 
 
2016
 
2015
 
2014
 
 
(in thousands)
Fixed maturities, available-for-sale
 
$
242,351

 
$
269,073

 
$
262,532

Equity securities, available-for-sale
 
1

 
2

 
2

Trading account assets
 
2,051

 
2,800

 
1,018

Commercial mortgage and other loans
 
58,940

 
86,354

 
81,848

Policy loans
 
62,735

 
62,304

 
60,847

Short-term investments and cash equivalents
 
1,767

 
1,042

 
528

Other long-term investments
 
29,512

 
17,739

 
16,962

Gross investment income
 
397,357

 
439,314

 
423,737

Less: investment expenses
 
(21,407
)
 
(22,727
)
 
(19,719
)
Net investment income
 
$
375,950

 
$
416,587

 
$
404,018



The carrying value of non-income producing assets included $0.6 million in fixed maturities as of December 31, 2016. Non-income producing assets represent investments that had not produced income for the twelve months preceding December 31, 2016.

Realized Investment Gains (Losses), Net 

Realized investment gains (losses), net, for the years ended December 31, were from the following sources: 

 
 
2016
 
2015
 
2014
 
 
(in thousands)
Fixed maturities
 
$
66,110

 
$
9,505

 
$
17,563

Equity securities
 
(1,570
)
 
397

 
1,085

Commercial mortgage and other loans
 
29,584

 
1,503

 
4,644

Joint ventures and limited partnerships
 
(229
)
 
320

 
210

Derivatives(1)
 
664,533

 
(220,292
)
 
90,556

Short-term investments and cash
 
21

 
29

 
9

Realized investment gains (losses), net
 
$
758,449

 
$
(208,538
)
 
$
114,067



(1)
Includes the offset of hedged items in qualifying effective hedge relationships prior to maturity or termination.

Net Unrealized Gains (Losses) on Investments by Asset Class

The table below presents net unrealized gains (losses) on investments by asset class as of December 31 for the years indicated: 
 
 
2016
 
2015
 
2014
 
 
(in thousands)
Fixed maturity securities on which an OTTI loss has been recognized
 
$
4,883

 
$
5,196

 
$
5,333

Fixed maturity securities, available-for-sale—all other
 
59,755

 
59,930

 
322,358

Equity securities, available-for-sale
 
366

 
(2,636
)
 
619

Derivatives designated as cash flow hedges(1)
 
40,931

 
48,271

 
11,585

Other investments
 
6,497

 
6,272

 
10,015

Net unrealized gains (losses) on investments
 
$
112,432

 
$
117,033

 
$
349,910


(1)
See Note 10 for more information on cash flow hedges.

Securities Lending and Repurchase Agreements

In the normal course of business, the Company sells securities under agreements to repurchase and enters into securities lending transactions. As of December 31, 2016, the Company had $74.8 million of securities lending transactions recorded as "Cash collateral for loaned securities," comprised of $68.0 million in corporate securities and $6.8 million in foreign government bonds, all of which had a remaining contractual maturity that was overnight and continuous. As of December 31, 2016, the Company had $68.9 million of repurchase transactions, all of which were U.S. Treasuries and had remaining contractual maturities that were overnight and continuous. As of December 31, 2015, the Company had $40.3 million of securities lending transactions recorded as "Cash collateral for loaned securities," comprised of $33.3 million in corporate securities and $7.0 million in foreign government bonds. Of the $40.3 million of securities lending transactions, $38.0 million had remaining contractual maturities that were overnight and continuous, while the other $2.3 million had remaining contractual maturities of up to thirty days. As of December 31, 2015, the Company had no repurchase transactions.

Securities Pledged, Restricted Assets and Special Deposits

The Company pledges as collateral investment securities it owns to unaffiliated parties through certain transactions, including securities lending, securities sold under agreements to repurchase, collateralized borrowings and postings of collateral with derivative counterparties. As of December 31 for the years indicated in the table below, the carrying value of investments pledged to third parties and the carrying amount of the associated liabilities supported by the pledged collateral as reported in the Consolidated Statements of Financial Position included the following:
 
 
 
2016
 
2015
 
 
(in thousands)
Pledged Collateral:
 
 
 
 
Fixed maturity securities, available-for-sale
 
$
140,810

 
$
38,421

Total securities pledged
 
$
140,810

 
$
38,421

Liabilities Supported by Pledged Collateral:
 
 
 
 
Cash collateral for loaned securities
 
$
74,976

 
$
40,416

Securities sold under agreements to repurchase
 
68,904

 
0

Total liabilities supported by pledged collateral
 
$
143,880

 
$
40,416



In the normal course of its business activities, the Company accepts collateral that can be sold or repledged. The primary sources of this collateral were securities purchased under agreements to resell. The fair value of this collateral was $58.4 million and $156.0 million at December 31, 2016 and 2015, respectively, none of which had either been sold or repledged.

As of December 31, 2016, fixed maturities and short-term investments of $3.2 million and $0.6 million, respectively, were on deposit with governmental authorities or trustees as required by certain insurance laws. As of December 31, 2015, fixed maturities of $3.9 million were on deposit with governmental authorities or trustees as required by certain insurance laws.