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Investments
9 Months Ended
Sep. 30, 2017
Investments [Abstract]  
Investments
INVESTMENTS

Fixed Maturities and Equity Securities

The following tables set forth information relating to fixed maturities and equity securities (excluding investments classified as trading), as of the dates indicated:
 
September 30, 2017
 
Amortized
Cost or 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
$
5,028,572

 
$
5,978

 
$
340,444

 
$
4,694,106

 
$
0

Obligations of U.S. states and their political subdivisions
101,051

 
1,243

 
751

 
101,543

 
0

Foreign government bonds
117,975

 
7,240

 
80

 
125,135

 
0

Public utilities
548,161

 
25,021

 
2,964

 
570,218

 
0

Redeemable preferred stock
29,524

 
867

 
0

 
30,391

 
0

All other U.S. public corporate securities
1,408,362

 
82,644

 
2,447

 
1,488,559

 
0

All other U.S. private corporate securities
1,039,396

 
37,163

 
5,695

 
1,070,864

 
0

All other foreign public corporate securities
183,645

 
6,313

 
452

 
189,506

 
0

All other foreign private corporate securities
622,040

 
29,557

 
4,668

 
646,929

 
0

Asset-backed securities(1)
366,108

 
3,546

 
53

 
369,601

 
(19
)
Commercial mortgage-backed securities
503,210

 
8,423

 
3,720

 
507,913

 
0

Residential mortgage-backed securities(2)
170,595

 
3,868

 
284

 
174,179

 
(4
)
Total fixed maturities, available-for-sale
$
10,118,639

 
$
211,863

 
$
361,558

 
$
9,968,944

 
$
(23
)
Equity securities, available-for-sale:
 
 
 
 
 
 
 
 
 
Common stocks:
 
 
 
 
 
 
 
 
 
Industrial, miscellaneous & other
$
0

 
$
0

 
$
0

 
$
0

 
 
Mutual funds
14

 
4

 
0

 
18

 
 
Total equity securities, available-for-sale
$
14

 
$
4

 
$
0

 
$
18

 
 

(1)
Includes credit-tranched securities collateralized by loan obligations, 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 "Accumulated other comprehensive income (loss)" ("AOCI"), which were not included in earnings. Amount excludes $9.0 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, 2016
 
Amortized
Cost or 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
$
4,998,652

 
$
2,487

 
$
536,114

 
$
4,465,025

 
$
0

Obligations of U.S. states and their political subdivisions
92,107

 
566

 
2,699

 
89,974

 
0

Foreign government bonds
64,352

 
5,404

 
370

 
69,386

 
0

Public utilities
448,349

 
13,155

 
10,348

 
451,156

 
0

Redeemable preferred stock
29,581

 
288

 
633

 
29,236

 
0

All other U.S. public corporate securities
1,619,814

 
73,819

 
10,153

 
1,683,480

 
(771
)
All other U.S. private corporate securities
951,324

 
27,234

 
13,810

 
964,748

 
(694
)
All other foreign public corporate securities
183,253

 
5,410

 
1,022

 
187,641

 
0

All other foreign private corporate securities
501,140

 
5,349

 
20,450

 
486,039

 
0

Asset-backed securities(1)
248,547

 
3,227

 
465

 
251,309

 
0

Commercial mortgage-backed securities
484,673

 
6,793

 
6,753

 
484,713

 
0

Residential mortgage-backed securities(2)
196,506

 
4,063

 
513

 
200,056

 
(5
)
Total fixed maturities, available-for-sale
$
9,818,298

 
$
147,795

 
$
603,330

 
$
9,362,763

 
$
(1,470
)
Equity securities, available-for-sale:
 
 
 
 
 
 
 
 
 
Common stocks:
 
 
 
 
 
 
 
 
 
Industrial, miscellaneous & other
$
351

 
$
0

 
$
351

 
$
0

 
 
Mutual funds
14

 
4

 
0

 
18

 
 
Total equity securities, available-for-sale
$
365

 
$
4

 
$
351

 
$
18

 
 

(1)
Includes credit-tranched securities collateralized by loan obligations, 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 $0.2 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 set forth the fair value and gross unrealized losses aggregated by investment category and length of time that individual fixed maturity and equity securities had been in a continuous unrealized loss position, as of the dates indicated:

 
September 30, 2017
 
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
$
1,410,256

 
$
69,022

 
$
3,045,887

 
$
271,422

 
$
4,456,143

 
$
340,444

Obligations of U.S. states and their political subdivisions
58,449

 
641

 
3,980

 
110

 
62,429

 
751

Foreign government bonds
15,564

 
77

 
145

 
3

 
15,709

 
80

Public utilities
106,170

 
1,592

 
23,175

 
1,372

 
129,345

 
2,964

Redeemable preferred stock
0

 
0

 
0

 
0

 
0

 
0

All other U.S. public corporate securities
182,387

 
940

 
83,448

 
1,507

 
265,835

 
2,447

All other U.S. private corporate securities
268,926

 
4,384

 
41,675

 
1,311

 
310,601

 
5,695

All other foreign public corporate securities
64,229

 
452

 
0

 
0

 
64,229

 
452

All other foreign private corporate securities
57,066

 
654

 
78,062

 
4,014

 
135,128

 
4,668

Asset-backed securities
36,356

 
50

 
177

 
3

 
36,533

 
53

Commercial mortgage-backed securities
181,908

 
2,131

 
62,060

 
1,589

 
243,968

 
3,720

Residential mortgage-backed securities
37,156

 
274

 
278

 
10

 
37,434

 
284

Total fixed maturities, available-for-sale
$
2,418,467

 
$
80,217

 
$
3,338,887

 
$
281,341

 
$
5,757,354

 
$
361,558

Equity securities, available-for-sale
$
0

 
$
0

 
$
0

 
$
0

 
$
0

 
$
0

 
 
December 31, 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
$
4,254,477

 
$
536,114

 
$
0

 
$
0

 
$
4,254,477

 
$
536,114

Obligations of U.S. states and their political subdivisions
73,885

 
2,699

 
0

 
0

 
73,885

 
2,699

Foreign government bonds
32,107

 
370

 
0

 
0

 
32,107

 
370

Public utilities
240,041

 
8,019

 
17,097

 
2,329

 
257,138

 
10,348

Redeemable preferred stock
12,948

 
633

 
0

 
0

 
12,948

 
633

All other U.S. public corporate securities
530,904

 
8,798

 
12,981

 
1,355

 
543,885

 
10,153

All other U.S. private corporate securities
453,976

 
13,632

 
12,304

 
178

 
466,280

 
13,810

All other foreign public corporate securities
89,962

 
1,016

 
9,994

 
6

 
99,956

 
1,022

All other foreign private corporate securities
247,111

 
11,661

 
58,214

 
8,789

 
305,325

 
20,450

Asset-backed securities
67,246

 
439

 
16,489

 
26

 
83,735

 
465

Commercial mortgage-backed securities
293,651

 
6,753

 
0

 
0

 
293,651

 
6,753

Residential mortgage-backed securities
68,283

 
513

 
0

 
0

 
68,283

 
513

Total fixed maturities, available-for-sale
$
6,364,591

 
$
590,647

 
$
127,079

 
$
12,683

 
$
6,491,670

 
$
603,330

Equity securities, available-for-sale
$
0

 
$
351

 
$
0

 
$
0

 
$
0

 
$
351



As of September 30, 2017 and December 31, 2016, the gross unrealized losses on fixed maturity securities were composed of $356.6 million and $594.9 million, respectively, related to "1" highest quality or "2" high quality securities based on the National Association of Insurance Commissioners (“NAIC”) or equivalent rating and $4.9 million and $8.4 million, respectively, related to other than high or highest quality securities based on NAIC or equivalent rating. As of September 30, 2017, the $281.3 million of gross unrealized losses on fixed maturity securities of twelve months or more were concentrated in U.S. government bonds, the consumer non-cyclical sector of the Company’s corporate securities and in commercial mortgage-backed securities. As of December 31, 2016, the $12.7 million of gross unrealized losses on fixed maturity securities of twelve months or more were concentrated in the consumer non-cyclical, finance and utility sectors of the Company’s corporate securities. In accordance with its policy described in Note 2 to the Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, the Company concluded that an adjustment to earnings for OTTI for these fixed maturity securities was not warranted at either September 30, 2017 or December 31, 2016. These conclusions were based on a detailed analysis of the underlying credit and cash flows on each security. Gross unrealized losses are primarily attributable to general credit spread widening, increases in interest rates and foreign currency exchange rate movements. As of September 30, 2017, the Company did not intend to sell these securities, and it was not more likely than not that the Company would be required to sell these securities before the anticipated recovery of the remaining amortized cost basis.

As of September 30, 2017, there were no gross unrealized losses on equity securities. As of December 31, 2016, all of the gross unrealized losses on equity securities represented declines in value of greater than 20%, all of which had been in that position for less than six months. In accordance with its policy described in Note 2 to the Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, the Company concluded that an adjustment to earnings for OTTI for these equity securities was not warranted.







The following table sets forth the amortized cost and fair value of fixed maturities by contractual maturities, as of the date indicated:
 
September 30, 2017
 
Amortized Cost
 
Fair Value
 
(in thousands)
Fixed maturities, available-for-sale:
 
 
 
Due in one year or less
$
409,701

 
$
411,603

Due after one year through five years
1,160,347

 
1,188,688

Due after five years through ten years
1,516,165

 
1,592,338

Due after ten years
5,992,513

 
5,724,622

Asset-backed securities
366,108

 
369,601

Commercial mortgage-backed securities
503,210

 
507,913

Residential mortgage-backed securities
170,595

 
174,179

Total fixed maturities, available-for-sale
$
10,118,639

 
$
9,968,944



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 do not have a single maturity date.

The following table sets forth 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 periods indicated:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Fixed maturities, available-for-sale:
 
 
 
 
 
 
 
Proceeds from sales(1)
$
115,316

 
$
80,589

 
$
382,792

 
$
3,280,497

Proceeds from maturities/prepayments
156,822

 
100,931

 
480,794

 
295,769

Gross investment gains from sales and maturities
(1,299
)
 
10,238

 
2,461

 
98,157

Gross investment losses from sales and maturities
(1,406
)
 
(257
)
 
(2,081
)
 
(1,303
)
OTTI recognized in earnings(2)
41

 
(82
)
 
(4,787
)
 
(2,020
)
Equity securities, available-for-sale:
 
 
 
 
 
 
 
Proceeds from sales
$
0

 
$
0

 
$
0

 
$
0

Gross investment gains from sales
0

 
0

 
0

 
0

Gross investment losses from sales
0

 
0

 
0

 
0

OTTI recognized in earnings
0

 
0

 
0

 
0


(1)
Includes $8.7 million and $46.1 million of non-cash related proceeds for the nine months ended September 30, 2017 and 2016, respectively.
(2)
Excludes the portion of OTTI recorded in “Other comprehensive income (loss)” ("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.

The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company for which a portion of the OTTI loss was recognized in OCI and the corresponding changes in such amounts, for the periods indicated:
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2017
 
Three Months Ended September 30, 2016
 
Nine Months Ended September 30, 2016
 
(in thousands)
Credit loss impairments:
 
Balance, beginning of period
$
200

 
$
1,325

 
$
43

 
$
86

New credit loss impairments
(1
)
 
365

 
0

 
0

Increases due to the passage of time on previously recorded credit losses
1

 
9

 
18

 
24

Reductions for securities which matured, paid down, prepaid or were sold during the period
(3
)
 
(18
)
 
(128
)
 
(1,972
)
Reductions for securities impaired to fair value during the period(1)
0

 
(1,481
)
 
82

 
1,271

Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected
(8
)
 
(11
)
 
(6
)
 
(7
)
Assets transferred to parent and affiliates
0

 
0

 
0

 
607

Balance, end of period
$
189

 
$
189

 
$
9

 
$
9



(1)
Represents circumstances where the Company determined in the current period that it intends to sell the security or it is more likely than not that it will be required to sell the security before recovery of the security's amortized cost.

Trading Account Assets

The following table sets forth the composition of “Trading account assets,” as of the dates indicated:
 
September 30, 2017
 
December 31, 2016
 
Amortized Cost or Cost
 
Fair Value
 
Amortized Cost or Cost
 
Fair Value
 
(in thousands)
Fixed maturities
$
161,385

 
$
162,811

 
$
147,057

 
$
139,513

Equity securities
11,320

 
15,836

 
7,551

 
10,358

Total trading account assets
$
172,705

 
$
178,647

 
$
154,608

 
$
149,871



The net change in unrealized gains (losses) from trading account assets still held at period end, recorded within “Asset administration fees and other income,” was $2.3 million and $(0.1) million for the three months ended September 30, 2017 and 2016, respectively, and $10.7 million and $15.5 million for the nine months ended September 30, 2017 and 2016, respectively.

Commercial Mortgage and Other Loans

The following table sets forth the composition of "Commercial mortgage and other loans," as of the dates indicated:
 
September 30, 2017
 
December 31, 2016
 
Amount
(in thousands)
 
% of
Total
 
Amount
(in thousands)
 
% of
Total
Commercial mortgage and agricultural property loans by property type:
 
 
 
 
 
 
 
Apartments/Multi-Family
$
327,526

 
23.2
%
 
$
277,296

 
22.5
%
Industrial
296,149

 
21.0

 
263,705

 
21.4

Hospitality
3,818

 
0.3

 
3,925

 
0.3

Office
309,119

 
21.9

 
294,304

 
23.8

Other
124,660

 
8.8

 
87,465

 
7.1

Retail
266,482

 
18.9

 
223,252

 
18.1

Total commercial mortgage loans
1,327,754

 
94.1

 
1,149,947

 
93.2

Agricultural property loans
83,725

 
5.9

 
84,235

 
6.8

Total commercial mortgage and agricultural property loans by property type
1,411,479

 
100.0
%
 
1,234,182

 
100.0
%
Valuation allowance
(2,819
)
 
 
 
(2,289
)
 
 
Total commercial mortgage and other loans
$
1,408,660

 
 
 
$
1,231,893

 
 


As of September 30, 2017, the commercial mortgage and agricultural property loans were geographically dispersed throughout the United States (with the largest concentrations in California (28%), Texas (12%) and New Jersey (6%)) and included loans secured by properties in Europe and Australia.

The following tables set forth the activity in the allowance for credit losses for commercial mortgage and other loans, as of the dates indicated:
 
September 30, 2017
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Total
 
(in thousands)
Allowance for credit losses:
 
 
 
 
 
Balance, beginning of year
$
2,267

 
$
22

 
$
2,289

Addition to (release of) allowance for losses
504

 
26

 
530

Charge-offs, net of recoveries
0

 
0

 
0

Total ending balance
$
2,771

 
$
48

 
$
2,819


 
December 31, 2016
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Total
 
(in thousands)
Allowance for credit losses:
 
 
 
 
 
Balance, beginning of year
$
622

 
$
21

 
$
643

Addition to (release of) allowance for losses
1,645

 
1

 
1,646

Charge-offs, net of recoveries
0

 
0

 
0

Total ending balance
$
2,267

 
$
22

 
$
2,289



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:
 
September 30, 2017
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Total
 
(in thousands)
Allowance for credit losses:
 
 
 
 
 
Individually evaluated for impairment
$
0

 
$
0

 
$
0

Collectively evaluated for impairment
2,771

 
48

 
2,819

Total ending balance(1)
$
2,771

 
$
48

 
$
2,819

Recorded investment(2):
 
 
 
 
 
Individually evaluated for impairment
$
1,608

 
$
5,509

 
$
7,117

Collectively evaluated for impairment
1,326,146

 
78,216

 
1,404,362

Total ending balance(1)
$
1,327,754

 
$
83,725

 
$
1,411,479


(1)
As of September 30, 2017, there were no loans acquired with deteriorated credit quality.
(2)
Recorded investment reflects the carrying value gross of related allowance.
 
December 31, 2016
 
Commercial Mortgage Loans
 
Agricultural Property Loans
 
Total
 
(in thousands)
Allowance for credit losses:
 
 
 
 
 
Individually evaluated for impairment
$
0

 
$
0

 
$
0

Collectively evaluated for impairment
2,267

 
22

 
2,289

Total ending balance(1)
$
2,267

 
$
22

 
$
2,289

Recorded investment(2):
 
 
 
 
 
Individually evaluated for impairment
$
1,715

 
$
0

 
$
1,715

Collectively evaluated for impairment
1,148,232

 
84,235

 
1,232,467

Total ending balance(1)
$
1,149,947

 
$
84,235

 
$
1,234,182


(1)
As of December 31, 2016, there were no loans acquired with deteriorated credit quality.
(2)
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:
 
September 30, 2017
 
Debt Service Coverage Ratio
 
 
 
≥ 1.2X
 
1.0X to <1.2X
 
< 1.0X
 
Total
 
(in thousands)
Loan-to-Value Ratio:
 
 
 
 
 
 
 
0%-59.99%
$
742,332

 
$
19,212

 
$
1,786

 
$
763,330

60%-69.99%
531,006

 
1,341

 
0

 
532,347

70%-79.99%
98,239

 
15,126

 
0

 
113,365

80% or greater
1,387

 
0

 
1,050

 
2,437

Total loans
$
1,372,964

 
$
35,679

 
$
2,836

 
$
1,411,479

 
December 31, 2016
 
Debt Service Coverage Ratio
 
 
 
≥ 1.2X
 
1.0X to <1.2X
 
< 1.0X
 
Total
 
(in thousands)
Loan-to-Value Ratio:
 
 
 
 
 
 
 
0%-59.99%
$
667,051

 
$
16,921

 
$
4,610

 
$
688,582

60%-69.99%
406,728

 
0

 
3,817

 
410,545

70%-79.99%
108,770

 
15,493

 
0

 
124,263

80% or greater
9,725

 
0

 
1,067

 
10,792

Total loans
$
1,192,274

 
$
32,414

 
$
9,494

 
$
1,234,182



The following tables set forth an aging of past due commercial mortgage and other loans 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:
 
September 30, 2017
 
Current
 
30-59 Days Past Due
 
60-89 Days Past Due
 
90 Days or More Past Due(1)
 
Total Loans
 
Non-Accrual Status(2)
 
(in thousands)
Commercial mortgage loans
$
1,327,754

 
$
0

 
$
0

 
$
0

 
$
1,327,754

 
$
0

Agricultural property loans
83,725

 
0

 
0

 
0

 
83,725

 
0

Total
$
1,411,479

 
$
0

 
$
0

 
$
0

 
$
1,411,479

 
$
0


(1)
As of September 30, 2017, there were no loans in this category accruing interest.
(2)
For additional information regarding the Company's policies for accruing interest on loans, see Note 2 to the Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.
 
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(2)
 
(in thousands)
Commercial mortgage loans
$
1,149,947

 
$
0

 
$
0

 
$
0

 
$
1,149,947

 
$
0

Agricultural property loans
84,235

 
0

 
0

 
0

 
84,235

 
0

Total
$
1,234,182

 
$
0

 
$
0

 
$
0

 
$
1,234,182

 
$
0



(1)
As of December 31, 2016, there were no loans in this category accruing interest.
(2)
For additional information regarding the Company's policies for accruing interest on loans, see Note 2 to the Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

For the three and nine months ended September 30, 2017 and 2016, there were no commercial mortgage and other loans acquired, other than those through direct origination, and there were no commercial mortgage and other loans sold. For both the three and nine months ended September 30, 2017, the Company received no commercial mortgage and other loans from related parties. For the three months ended September 30, 2016, there were no transfers of commercial mortgage and other loans from related parties. For the nine months ended September 30, 2016, the Company received $580 million of commercial mortgage and other loans from related parties.

The Company’s commercial mortgage and other loans may occasionally be involved in a troubled debt restructuring. For the three and nine months ended September 30, 2017 and 2016, there were no new troubled debt restructurings related to commercial mortgage and other loans and no payment defaults on commercial mortgage and other loans that were modified as a troubled debt restructuring within the twelve months preceding. As of both September 30, 2017 and December 31, 2016, the Company had no significant commitments to provide additional funds to borrowers that had been involved in a troubled debt restructuring. For additional information relating to the accounting for troubled debt restructurings, see Note 2 to the Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

Other Long-Term Investments

The following table sets forth the composition of “Other long-term investments,” as of the dates indicated:
 
September 30, 2017
 
December 31, 2016
 
(in thousands)
Joint ventures and limited partnerships:
 
 
 
Private equity
$
30,178

 
$
30,513

Hedge funds
104,849

 
98,554

Real estate-related
47,009

 
109,043

Total joint ventures and limited partnerships
182,036

 
238,110

Derivatives
7,984

 
313,821

Total other long-term investments
$
190,020

 
$
551,931



Net Investment Income

The following table sets forth "Net investment income" by investment type, for the periods indicated:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Fixed maturities, available-for-sale
$
83,198

 
$
75,271

 
$
246,853

 
$
168,655

Trading account assets
1,176

 
1,128

 
3,429

 
2,193

Commercial mortgage and other loans
12,777

 
11,730

 
36,313

 
28,106

Policy loans
114

 
185

 
810

 
517

Short-term investments and cash equivalents
9,700

 
10,615

 
22,618

 
18,312

Other long-term investments
4,771

 
20,176

 
15,718

 
23,162

Gross investment income
111,736

 
119,105

 
325,741

 
240,945

Less: investment expenses
(3,783
)
 
(3,787
)
 
(11,431
)
 
(7,798
)
Net investment income
$
107,953

 
$
115,318

 
$
314,310

 
$
233,147



Realized Investment Gains (Losses), Net 

The following table sets forth "Realized investment gains (losses), net," by investment type, for the periods indicated:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Fixed maturities
$
(2,664
)
 
$
9,899

 
$
(4,407
)
 
$
94,834

Commercial mortgage and other loans
(430
)
 
(422
)
 
(660
)
 
(1,823
)
Joint ventures and limited partnerships
(3
)
 
(167
)
 
(37
)
 
(649
)
Derivatives(1)
1,173,163

 
(45,139
)
 
(322,456
)
 
(2,590,550
)
Short-term investments and cash equivalents
11

 
104

 
48

 
527

Realized investment gains (losses), net
$
1,170,077

 
$
(35,725
)
 
$
(327,512
)
 
$
(2,497,661
)


(1)
Includes the hedged items offset in qualifying fair value hedge accounting relationships.

Net Unrealized Gains (Losses) on Investments

The following table sets forth net unrealized gains (losses) on investments, as of the dates indicated:
 
September 30, 2017
 
December 31, 2016
 
(in thousands)
Fixed maturity securities, available-for-sale — with OTTI
$
8,985

 
$
(1,261
)
Fixed maturity securities, available-for-sale — all other
(158,680
)
 
(454,274
)
Equity securities, available-for-sale
4

 
(347
)
Affiliated notes
937

 
1,181

Derivatives designated as cash flow hedges(1)
(15,398
)
 
11,745

Other investments
(97
)
 
(619
)
Net unrealized gains (losses) on investments
$
(164,249
)
 
$
(443,575
)

(1)
See Note 5 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. The following table sets forth the composition of "Cash collateral for loaned securities," which represents the liability to return cash collateral received for the following types of securities loaned, as of the dates indicated:
 
September 30, 2017
 
December 31, 2016
 
Remaining Contractual Maturities of the Agreements
 
 
 
Remaining Contractual Maturities of the Agreements
 
 
 
Overnight & Continuous
 
Up to 30 Days
 
Total
 
Overnight & Continuous
 
Up to 30 Days
 
Total
 
(in thousands)
 
(in thousands)
Foreign government bonds
$
83

 
$
0

 
$
83

 
$
10,712

 
$
0

 
$
10,712

U.S. public corporate securities
7,752

 
0

 
7,752

 
12,638

 
0

 
12,638

Foreign public corporate securities
0

 
0

 
0

 
0

 
0

 
0

Total cash collateral for loaned securities(1)
$
7,835

 
$
0

 
$
7,835

 
$
23,350

 
$
0

 
$
23,350


(1)
The Company did not have agreements with remaining contractual maturities of thirty days or greater, as of the dates indicated.

As of September 30, 2017 and December 31, 2016, the Company had no "Securities sold under agreements to repurchase."