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Investments
12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Investments
Investments

Portfolio Composition:
 
A summary of fixed maturities available for sale by cost or amortized cost and estimated fair value at December 31, 2017 and 2016 is as follows:
2017:
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value(1)
 
% of Total
Fixed
Maturities
(2)
Fixed maturities available for sale:
 
 
 
 
 
 
 
 
 
U.S. Government direct, guaranteed, and government-sponsored enterprises
$
390,646

 
$
18,173

 
$
(1,373
)
 
$
407,446

 
2
States, municipalities, and political subdivisions
1,091,960

 
127,890

 
(135
)
 
1,219,715

 
7
Foreign governments
20,236

 
1,782

 

 
22,018

 
Corporates, by sector:
 
 
 
 
 
 
 
 
 
Financial
3,282,526

 
475,961

 
(23,392
)
 
3,735,095

 
22
Utilities
1,955,737

 
369,406

 
(1,298
)
 
2,323,845

 
14
Energy
1,619,349

 
226,140

 
(25,392
)
 
1,820,097

 
11
Other corporate sectors
6,065,803

 
747,612

 
(20,616
)
 
6,792,799

 
40
Total corporates
12,923,415

 
1,819,119

 
(70,698
)
 
14,671,836

 
87
Collateralized debt obligations
59,150

 
20,084

 
(7,653
)
 
71,581

 
Other asset-backed securities
144,520

 
4,835

 

 
149,355

 
1
Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
 
 
Financial
336,621

 
62,892

 
(2,727
)
 
396,786

 
3
Utilities
28,553

 
2,132

 
(97
)
 
30,588

 
Total redeemable preferred stocks
365,174

 
65,024

 
(2,824
)
 
427,374

 
3
Total fixed maturities
$
14,995,101

 
$
2,056,907

 
$
(82,683
)
 
$
16,969,325

 
100
(1) Amount reported in the balance sheet.
(2) At fair value.

2016:
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value(1)
 
% of Total
Fixed
Maturities
(2)
Fixed maturities available for sale:
 
 
 
 
 
 
 
 
 
U.S. Government direct, guaranteed, and government-sponsored enterprises
$
381,054

 
$
895

 
$
(9,151
)
 
$
372,798

 
3
States, municipalities, and political subdivisions
1,284,605

 
126,850

 
(1,327
)
 
1,410,128

 
9
Foreign governments
21,701

 
1,438

 
(62
)
 
23,077

 
Corporates, by sector:
 
 
 
 
 
 
 
 
 
Financial
2,963,584

 
285,037

 
(45,885
)
 
3,202,736

 
21
Utilities
1,875,946

 
249,701

 
(12,604
)
 
2,113,043

 
14
Energy
1,542,426

 
127,989

 
(44,324
)
 
1,626,091

 
11
Other corporate sectors
5,601,136

 
424,021

 
(84,547
)
 
5,940,610

 
39
Total corporates
11,983,092

 
1,086,748

 
(187,360
)
 
12,882,480

 
85
Collateralized debt obligations
60,726

 
13,062

 
(10,285
)
 
63,503

 
Other asset-backed securities
56,410

 
621

 
(337
)
 
56,694

 
Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
 
 
Financial
371,862

 
43,383

 
(7,218
)
 
408,027

 
3
Utilities
28,600

 
798

 
(244
)
 
29,154

 
Total redeemable preferred stocks
400,462

 
44,181

 
(7,462
)
 
437,181

 
3
Total fixed maturities
$
14,188,050

 
$
1,273,795

 
$
(215,984
)
 
$
15,245,861

 
100
(1) Amount reported in the balance sheet.
(2) At fair value.

Securities, cash, and short-term investments held on deposit with various state and federal regulatory authorities had an amortized cost and fair value, respectively, of $657 million and $753 million at December 31, 2017 and $600 million and $663 million at December 31, 2016.

A schedule of fixed maturities available for sale by contractual maturity date at December 31, 2017 is shown below on an amortized cost basis and on a fair value basis. Actual maturity dates could differ from contractual maturities due to call or prepayment provisions.

Amortized
Cost
 
Fair
Value
Fixed maturities available for sale:
 
 
 
Due in one year or less
$
147,457

 
$
149,495

Due after one year through five years
682,932

 
720,186

Due after five years through ten years
1,397,473

 
1,567,972

Due after ten years through twenty years
4,701,591

 
5,519,917

Due after twenty years
7,861,000

 
8,789,769

Mortgage-backed and asset-backed securities
204,648

 
221,986


$
14,995,101

 
$
16,969,325


 
Analysis of investment operations:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Net investment income is summarized as follows:
 
 
 
 
 
Fixed maturities available for sale
$
817,213

 
$
778,912

 
$
747,663

Policy loans
39,578

 
38,436

 
36,763

Other long-term investments
4,991

 
2,786

 
2,021

Short-term investments
948

 
447

 
95

 
862,730

 
820,581

 
786,542

Less investment expense
(14,845
)
 
(13,678
)
 
(12,591
)
Net investment income
$
847,885

 
$
806,903

 
$
773,951


An analysis of realized gains (losses) from investments is as follows:
 
 
 
 
 
Realized investment gains (losses):
 
 
 
 
 
Fixed maturities available for sale:
 
 
 
 
 
Sales and other
$
35,199

 
$
(10,645
)
 
$
(9,479
)
Other-than-temporary impairments
(245
)
 

 

Other investments
(7,302
)
 
(38
)
 
688

Loss on redemption on debt
(4,041
)
 

 

 
23,611

 
(10,683
)
 
(8,791
)
Applicable tax
(6,021
)
 
3,739

 
3,077

Realized gains (losses) from investments, net of tax
$
17,590

 
$
(6,944
)
 
$
(5,714
)

An analysis of the net change in unrealized investment gains (losses) is as follows:
 
 
 
 
 
Fixed maturities available for sale
$
916,413

 
$
551,658

 
$
(1,163,295
)
Other investments
5,008

 
2,143

 
(2,737
)
Net change in unrealized gains (losses)
$
921,421

 
$
553,801

 
$
(1,166,032
)


Additional information about securities sold is as follows:
 
At December 31,
 
2017
 
2016
 
2015
Fixed maturities available for sale:
 
 
 
 
 
Proceeds from sales(1)
$
67,246

 
$
358,285

 
$
226,792

Gross realized gains
5,079

 
6,133

 
259

Gross realized losses
(1,100
)
 
(32,608
)
 
(16,894
)
(1)
Includes unsettled sales of $17.9 million at December 31, 2016. There were no unsettled sales in 2017 or 2015.
Fair value measurements: The following tables represent the fair value of fixed maturities measured on a recurring basis at December 31, 2017 and 2016:
 
Fair Value Measurements at December 31, 2017 Using:
Description
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
 
Significant Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
 
Total Fair
Value
Fixed maturities available for sale:
 
 
 
 
 
 
 
U.S. Government direct, guaranteed, and government-sponsored enterprises
$

 
$
407,446

 
$

 
$
407,446

States, municipalities, and political subdivisions
44

 
1,219,671

 

 
1,219,715

Foreign governments

 
22,018

 

 
22,018

Corporates, by sector:
 
 
 
 
 
 
 
Financial

 
3,673,089

 
62,006

 
3,735,095

Utilities

 
2,168,115

 
155,730

 
2,323,845

Energy

 
1,779,281

 
40,816

 
1,820,097

Other corporate sectors

 
6,468,541

 
324,258

 
6,792,799

Total corporates

 
14,089,026

 
582,810

 
14,671,836

Collateralized debt obligations

 

 
71,581

 
71,581

Other asset-backed securities

 
135,306

 
14,049

 
149,355

Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
Financial

 
396,786

 

 
396,786

Utilities

 
30,588

 

 
30,588

Total redeemable preferred stocks

 
427,374

 

 
427,374

Total fixed maturities
$
44

 
$
16,300,841

 
$
668,440

 
$
16,969,325

Percentage of total
%
 
96.1
%
 
3.9
%
 
100.0
%
 
Fair Value Measurements at December 31, 2016 Using:
Description
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
 
Significant Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
 
Total Fair
Value
Fixed maturities available for sale:
 
 
 
 
 
 
 
U.S. Government direct, guaranteed, and government-sponsored enterprises
$

 
$
372,798

 
$

 
$
372,798

States, municipalities, and political subdivisions
45,302

 
1,364,826

 

 
1,410,128

Foreign governments

 
23,077

 

 
23,077

Corporates, by sector:
 
 
 
 
 
 
 
Financial

 
3,141,611

 
61,125

 
3,202,736

Utilities

 
1,959,143

 
153,900

 
2,113,043

Energy

 
1,598,976

 
27,115

 
1,626,091

Other corporate sectors

 
5,623,150

 
317,460

 
5,940,610

Total corporates

 
12,322,880

 
559,600

 
12,882,480

Collateralized debt obligations

 

 
63,503

 
63,503

Other asset-backed securities

 
56,694

 

 
56,694

Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
Financial

 
408,027

 

 
408,027

Utilities

 
29,154

 

 
29,154

Total redeemable preferred stocks

 
437,181

 

 
437,181

Total fixed maturities
$
45,302

 
$
14,577,456

 
$
623,103

 
$
15,245,861

Percentage of total
0.3
%
 
95.6
%
 
4.1
%
 
100.0
%

The following table represents changes in fixed maturities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
 
 
 
Analysis of Changes in Fair Value Measurements Using Significant
Unobservable Inputs (Level 3)
 
Asset-
backed
securities
 
Collateralized
debt
Obligations
 
Corporates
 
Total
Balance at January 1, 2015
$

 
$
63,232

 
$
512,714

 
$
575,946

Total gains or losses:
 
 
 
 
 
 
 
Included in realized gains/losses

 

 
1,182

 
1,182

Included in other comprehensive income

 
11,365

 
(11,925
)
 
(560
)
Acquisitions

 

 
38,600

 
38,600

Sales

 

 

 

Amortization

 
5,536

 
17

 
5,553

Other(1)

 
(9,751
)
 
(9,782
)
 
(19,533
)
Transfers into (out of) Level 3(2)

 

 

 

Balance at December 31, 2015

 
70,382

 
530,806

 
601,188

Total gains or losses:
 
 
 
 
 
 
 
Included in realized gains/losses

 

 
788

 
788

Included in other comprehensive income

 
(3,943
)
 
6,403

 
2,460

Acquisitions

 

 
33,662

 
33,662

Sales

 

 

 

Amortization

 
5,186

 
17

 
5,203

Other(1)

 
(8,122
)
 
(12,076
)
 
(20,198
)
Transfers into (out of) Level 3(2)

 

 

 

Balance at December 31, 2016

 
63,503

 
559,600

 
623,103

Total gains or losses:
 
 
 
 
 
 
 
Included in realized gains/losses

 

 

 

Included in other comprehensive income
410

 
9,654

 
10,900

 
20,964

Acquisitions
14,000

 

 
21,666

 
35,666

Sales

 

 

 

Amortization

 
4,914

 
17

 
4,931

Other(1)
(361
)
 
(6,490
)
 
(9,373
)
 
(16,224
)
Transfers into (out of) Level 3(2)

 

 

 

Balance at December 31, 2017
$
14,049

 
$
71,581

 
$
582,810

 
$
668,440


(1) Includes foreign exchange adjustments and principal repayments. 
(2) There were no transfers in or out of Level 3 during the three years ended 2017.
 
Acquisitions of Level 3 investments in each of the years 2015 through 2017 are comprised of private-placement fixed maturities managed by an unaffiliated third-party.
 
Quantitative Information about Level 3
Fair Value Measurements
As of December 31, 2017

Fair Value
 
Valuation
Techniques
 
Significant Unobservable
Input
 
Range
 
Weighted
Average
Asset-backed securities
$
14,049

 
Determination of credit spread
 
Credit
rating
 
BBB
 
BBB



 
Discounted cash flows
 
Discount
rate
 
5.35%
 
5.35%
Collateralized debt obligations
71,581

 
Discounted cash flows
 
Discount
rate
 
7.0 - 8.25%
 
8.03%
Private placement fixed maturities
$
582,810

 
Determination of credit spread
 
Credit
rating
 
A+ to BB-
 
BBB
 
 
 
Discounted cash flows
 
Discount
rate
 
2.97 - 7.27%
 
3.93%

$
668,440

 
 
 
 
 
 
 
 


The private placement fixed maturities and asset-backed securities reported as Level 3 are managed by third party investment managers. These securities are valued based on the contractual cash flows discounted by a yield determined as a treasury benchmark adjusted for a credit spread. The credit spread is developed from observable indices for similar public fixed maturities and unobservable indices for private fixed maturities for corresponding credit ratings. However, the credit ratings for the securities are considered unobservable inputs, as they are assigned by the third party investment manager based on a quantitative and qualitative assessment of the credit underwritten. A higher (lower) credit rating would result in a higher (lower) valuation.

The collateral underlying collateralized debt obligations for which fair values are reported as Level 3 consists primarily of trust preferred securities issued by banks and insurance companies. Collateralized debt obligations are valued at the present value of expected future cash flows using an unobservable discount rate. Expected cash flows are determined by scheduling the projected repayment of the collateral assuming no future defaults, deferrals, or recoveries. The discount rate is risk-adjusted to take these items into account. A significant increase (decrease) in the discount rate will produce a significant decrease (increase) in fair value. Additionally, a significant increase (decrease) in the cash flow expectations would result in a significant increase (decrease) in fair value. For more information regarding valuation procedures, please refer to Note 1—Significant Accounting Policies under the caption Fair Value Measurements, Investments in Securities.
 
The following table presents transfers in and out of each of the valuation levels of fair values.
 
2017
 
2016
 
2015
 
In
 
Out
 
Net
 
In
 
Out
 
Net
 
In
 
Out
 
Net
Level 1
$
42,372

 
$
(597
)
 
$
41,775

 
$
45,344

 
$

 
$
45,344

 
$
17,252

 
$
(49,744
)
 
$
(32,492
)
Level 2
597

 
(42,372
)
 
(41,775
)
 

 
(45,344
)
 
(45,344
)
 
49,744

 
(17,252
)
 
32,492

Level 3

 

 

 

 

 

 

 

 


 
Transfers into Level 2 from Level 3 result from the availability of observable market data when a security is valued at the end of a period. Transfers into Level 3 occur when there is a lack of observable market information. Transfers into Level 1 from Level 2 occur when direct quotes are available; transfers from Level 1 into Level 2 result when only observable market data and no direct quotes are available. Transfers between levels are recognized as of the end of the period of transfer.

Other-than-temporary impairments (OTTI): Based on the Company's evaluation of its fixed maturities available for sale in an unrealized loss position in accordance with the OTTI policy as described in Note 1—Significant Accounting Policies, the Company concluded that there was an other-than-temporary impairment of $245 thousand ($159 thousand, net of tax) during the year ended December 31, 2017. For the two years ended December 31, 2016, there were no other-than-temporary impairments.

As of year end 2017, previously written down securities remaining in the portfolio were carried at a fair value of $59 million, or less than 0.4% of the fair value of the fixed maturity portfolio. Torchmark is continuously monitoring the market conditions impacting its portfolio. While adverse market conditions for an extended duration could lead to some ratings downgrades in certain sectors, Torchmark has the ability and intent to hold these investments to recovery, and does not intend to sell or expect to be required to sell any of its securities in such a position.
 
Unrealized gains/loss analysis: The following tables disclose gross unrealized investment losses by class and major sector of investments at December 31, 2017 and December 31, 2016 for the respective periods of time in a loss position. Torchmark considers these investments to be only temporarily impaired.
 
ANALYSIS OF GROSS UNREALIZED INVESTMENT LOSSES
At December 31, 2017
 
Less than
Twelve Months
 
Twelve Months
or Longer
 
Total
Description of Securities
Fair
Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Fixed maturities available for sale:
 
 
 
 
 
 
 
 
 
 
 
Investment grade securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government direct, guaranteed, and government-sponsored enterprises
$
34,388

 
$
(422
)
 
$
47,514

 
$
(951
)
 
$
81,902

 
$
(1,373
)
States, municipalities and political subdivisions
4,561

 
(21
)
 
1,771

 
(9
)
 
6,332

 
(30
)
Foreign governments

 

 

 

 

 

Corporates, by sector:
 
 
 
 
 
 
 
 


 


Financial
133,080

 
(652
)
 
35,302

 
(1,429
)
 
168,382

 
(2,081
)
Utilities
48,562

 
(569
)
 
32,345

 
(729
)
 
80,907

 
(1,298
)
Energy
23,463

 
(81
)
 
67,775

 
(3,682
)
 
91,238

 
(3,763
)
Metals and mining

 

 

 

 

 

Other corporate sectors
220,661

 
(2,312
)
 
163,886

 
(4,257
)
 
384,547

 
(6,569
)
Total corporates
425,766

 
(3,614
)
 
299,308

 
(10,097
)
 
725,074

 
(13,711
)
Other asset-backed securities

 

 

 

 

 

Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
 
 
 
 
Utilities

 

 
5,953

 
(97
)
 
5,953

 
(97
)
Total redeemable preferred stocks

 

 
5,953

 
(97
)
 
5,953

 
(97
)
Total investment grade securities
464,715

 
(4,057
)
 
354,546

 
(11,154
)
 
819,261

 
(15,211
)
 
 
 
 
 
 
 
 
 
 
 
 
Below investment grade securities:
 
 
 
 
 
 
 
 
 
 
 
States, municipalities and political subdivisions
200

 
(105
)
 

 

 
200

 
(105
)
Corporates, by sector:


 


 


 


 
 
 
 
Financial

 

 
84,432

 
(21,311
)
 
84,432

 
(21,311
)
Energy
8,114

 
(104
)
 
75,204

 
(21,525
)
 
83,318

 
(21,629
)
Metals and mining

 

 

 

 

 

Other corporate sectors
25,334

 
(5,066
)
 
54,383

 
(8,981
)
 
79,717

 
(14,047
)
Total corporates
33,448

 
(5,170
)
 
214,019

 
(51,817
)
 
247,467

 
(56,987
)
Collateralized debt obligations

 

 
12,347

 
(7,653
)
 
12,347

 
(7,653
)
Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
 
 
 
 
Financial

 

 
24,376

 
(2,727
)
 
24,376

 
(2,727
)
Total redeemable preferred stocks

 

 
24,376

 
(2,727
)
 
24,376

 
(2,727
)
Total below investment grade securities
33,648

 
(5,275
)
 
250,742

 
(62,197
)
 
284,390

 
(67,472
)
Total fixed maturities
$
498,363

 
$
(9,332
)
 
$
605,288

 
$
(73,351
)
 
$
1,103,651

 
$
(82,683
)
 
ANALYSIS OF GROSS UNREALIZED INVESTMENT LOSSES
At December 31, 2016
 
Less than
Twelve Months
 
Twelve Months
or Longer
 
Total
Description of Securities
Fair Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Fixed maturities available for sale:
 
 
 
 
 
 
 
 
 
 
 
Investment grade securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government direct, guaranteed, and government-sponsored enterprises
$
321,133

 
$
(8,553
)
 
$
1,404

 
$
(598
)
 
$
322,537

 
$
(9,151
)
States, municipalities and political subdivisions
32,178

 
(1,114
)
 
683

 
(19
)
 
32,861

 
(1,133
)
Foreign governments
4,416

 
(62
)
 

 

 
4,416

 
(62
)
Corporates, by sector:

 

 

 

 

 

Financial
479,669

 
(18,666
)
 
64,335

 
(4,627
)
 
544,004

 
(23,293
)
Utilities
290,732

 
(11,000
)
 
16,977

 
(1,604
)
 
307,709

 
(12,604
)
Energy
83,064

 
(1,076
)
 
154,908

 
(18,127
)
 
237,972

 
(19,203
)
Metals and mining
5,936

 
(231
)
 
5,789

 
(187
)
 
11,725

 
(418
)
Other corporate sectors
1,564,273

 
(65,131
)
 
68,968

 
(6,495
)
 
1,633,241

 
(71,626
)
Total corporates
2,423,674

 
(96,104
)
 
310,977

 
(31,040
)
 
2,734,651

 
(127,144
)
Other asset-backed securities
41,498

 
(337
)
 

 

 
41,498

 
(337
)
Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
 
 
 
 
Utilities
5,857

 
(244
)
 

 

 
5,857

 
(244
)
Total redeemable preferred stocks
5,857

 
(244
)
 

 

 
5,857

 
(244
)
Total investment grade securities
2,828,756

 
(106,414
)
 
313,064

 
(31,657
)
 
3,141,820

 
(138,071
)
 
 
 
 
 
 
 
 
 
 
 
 
Below investment grade securities:
 
 
 
 
 
 
 
 
 
 
 
States, municipalities and political subdivisions

 

 
357

 
(194
)
 
357

 
(194
)
Corporates, by sector:
 
 
 
 
 
 
 
 
 
 
 
Financial

 

 
83,174

 
(22,592
)
 
83,174

 
(22,592
)
Energy
15,567

 
(385
)
 
91,165

 
(24,736
)
 
106,732

 
(25,121
)
Metals and mining
32,478

 
(172
)
 
34,463

 
(2,023
)
 
66,941

 
(2,195
)
Other corporate sectors
51,640

 
(291
)
 
95,679

 
(10,017
)
 
147,319

 
(10,308
)
Total corporates
99,685

 
(848
)
 
304,481

 
(59,368
)
 
404,166

 
(60,216
)
Collateralized debt obligations

 

 
9,714

 
(10,285
)
 
9,714

 
(10,285
)
Redeemable preferred stocks, by sector:
 
 
 
 
 
 
 
 
 
 
 
Financial

 

 
19,912

 
(7,218
)
 
19,912

 
(7,218
)
Total redeemable preferred stocks

 

 
19,912

 
(7,218
)
 
19,912

 
(7,218
)
Total below investment grade securities
99,685

 
(848
)
 
334,464

 
(77,065
)
 
434,149

 
(77,913
)
Total fixed maturities
$
2,928,441

 
$
(107,262
)
 
$
647,528

 
$
(108,722
)
 
$
3,575,969

 
$
(215,984
)

 
Gross unrealized losses decreased from $216 million at year end 2016 to $83 million at year end 2017, a decrease of $133 million. The decrease in the gross unrealized losses from prior year was primarily attributable to the improved conditions during 2017 in the energy sector and broadly across all sectors.


Additional information about fixed maturities available for sale in an unrealized loss position is as follows:

Less than
Twelve
Months
 
Twelve
Months
or Longer
 
Total
Number of issues (CUSIP numbers) held:

 

 
 
As of December 31, 2017
92

 
102

 
194

As of December 31, 2016
407

 
94

 
501


 
Torchmark’s entire fixed maturity portfolio consisted of 1,502 issues at December 31, 2017 and 1,565 issues at December 31, 2016. The weighted-average quality rating of all unrealized loss positions at amortized cost was BBB- for 2017 and BBB+ for 2016.

Other investment information:
 
Other long-term investments consist of the following:
 
Year Ended December 31,
 
2017
 
2016
Investment in limited partnerships
$
66,522

 
$
51,509

Commercial mortgage participations(1)
39,489

 

Other
2,548

 
2,343

Total
$
108,559

 
$
53,852



(1) A mortgage participation is a legal right to a prorata interest in a mortgage loan.
 
Torchmark did not have any invested assets that were non-income producing during the twelve months ended December 31, 2017.

Concentrations of Credit Risk: Torchmark maintains a diversified investment portfolio with limited concentration in any given issuer. At December 31, 2017, the investment portfolio, at fair value, consisted of the following:
Investment grade fixed maturities:
 
Corporate securities
82
%
Securities of state and municipal governments
7

Government-sponsored enterprises
2

Other
1

Below investment grade fixed maturities:
 
Corporate securities
3

Other
1

Policy loans, which are secured by the underlying insurance policy values
3

Other investments
1

 
100
%


As of December 31, 2017, securities of state and municipal governments represented 7% of invested assets at fair value. Such investments are made throughout the U.S. At yearend 2017, the state and municipal bond portfolio at fair value was invested in securities issued within the following states: Texas (29%), Ohio (9%), Washington (8%), Illinois (7%), Michigan (5%), and Georgia (5%). Otherwise, there was no concentration within any given state greater than 5%.

Corporate debt securities and redeemable preferred stocks represent 85% of Torchmark's investment portfolio. These investments are spread across a wide range of industries. Below are the ten largest industry concentrations held in the corporate portfolio of corporate debt securities and redeemable preferred stocks at December 31, 2017, based on fair value:
Insurance
16
%
Electric utilities
12

Oil and natural gas pipelines
7

Banks
6

Transportation
4

Oil and natural gas exploration and production
4

Chemicals
4

Real estate investment trusts
4

Food
3

Metals and mining
3


 
At yearend 2017, 4% of invested assets at fair value were represented by fixed maturities rated below investment grade. Par value of these investments was $790 million, amortized cost was $702 million, and fair value was $679 million. While these investments could be subject to additional credit risk, such risk should generally be reflected in their fair value.