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Summary of Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Summary of fixed maturity investments classified as available-for-sale and the non-credit related components of OTTI in AOCI
The following tables summarize fixed maturity investments classified as available-for-sale and the non-credit-related component of OTTI in AOCI:
 
 
December 31, 2015
 
 
Amortized
 
Gross unrealized
 
Gross unrealized
 
Estimated fair value
 
OTTI (gain) loss
Fixed maturities:
 
cost
 
gains
 
losses
 
and carrying value
 
included in AOCI (1)
U.S. government direct obligations and U.S. agencies
 
$
3,291,167

 
$
55,193

 
$
4,608

 
$
3,341,752

 
$
—

Obligations of U.S. states and their subdivisions
 
1,988,214

 
238,862

 
7,903

 
2,219,173

 
50

Foreign government securities
 
2,291

 
—

 
5

 
2,286

 
—

Corporate debt securities (2)
 
12,388,886

 
437,207

 
320,381

 
12,505,712

 
(1,810
)
Asset-backed securities
 
1,196,326

 
128,406

 
13,362

 
1,311,370

 
(86,474
)
Residential mortgage-backed securities
 
122,146

 
4,734

 
1,508

 
125,372

 
(123
)
Commercial mortgage-backed securities
 
1,009,320

 
19,117

 
11,529

 
1,016,908

 
—

Collateralized debt obligations
 
9,112

 
—

 
58

 
9,054

 
—

Total fixed maturities
 
$
20,007,462

 
$
883,519

 
$
359,354

 
$
20,531,627

 
$
(88,357
)
 

(1) Indicates the amount of any OTTI (gain) loss included in AOCI that is included in gross unrealized gains and losses.  OTTI (gain) loss included in AOCI, as presented above, includes both the initial recognition of non-credit losses and the effects of subsequent increases and decreases in estimated fair value for those fixed maturity securities with previous non-credit impairment. The non-credit loss component of OTTI (gain) loss was in an unrealized gain position due to increases in estimated fair value subsequent to initial recognition of non-credit losses on such securities.
(2) Includes perpetual debt investments with amortized cost of $149,062 and estimated fair value of $116,423.
 
 
 
December 31, 2014
 
 
Amortized
 
Gross unrealized
 
Gross unrealized
 
Estimated fair value
 
OTTI (gain) loss
Fixed maturities:
 
cost
 
gains
 
losses
 
and carrying value
 
included in AOCI (1)
U.S. government direct obligations and U.S. agencies
 
$
3,478,153

 
$
70,597

 
$
1,494

 
$
3,547,256

 
$
—

Obligations of U.S. states and their subdivisions
 
1,885,715

 
287,668

 
899

 
2,172,484

 
—

Foreign government securities
 
2,455

 
—

 
4

 
2,451

 
—

Corporate debt securities (2)
 
11,258,517

 
763,036

 
82,104

 
11,939,449

 
(2,228
)
Asset-backed securities
 
1,263,089

 
149,152

 
13,702

 
1,398,539

 
(96,603
)
Residential mortgage-backed securities
 
167,793

 
7,368

 
1,932

 
173,229

 
(185
)
Commercial mortgage-backed securities
 
886,748

 
32,556

 
1,099

 
918,205

 
—

Collateralized debt obligations
 
10,674

 
—

 
209

 
10,465

 
—

Total fixed maturities
 
$
18,953,144

 
$
1,310,377

 
$
101,443

 
$
20,162,078

 
$
(99,016
)
 
(1) Indicates the amount of any OTTI (gain) loss included in AOCI that is included in gross unrealized gains and losses.  OTTI (gain) loss included in AOCI, as presented above, includes both the initial recognition of non-credit losses and the effects of subsequent increases and decreases in estimated fair value for those fixed maturity securities with previous non-credit impairment. The non-credit loss component of OTTI (gain) loss was in an unrealized gain position due to increases in estimated fair value subsequent to initial recognition of non-credit losses on such securities.
(2) Includes perpetual debt investments with amortized cost of $157,742 and estimated fair value of $131,799.
Schedule of amortized cost and estimated fair value of fixed maturity investments classified as available-for-sale
The amortized cost and estimated fair value of fixed maturity investments classified as available-for-sale, based on estimated cash flows, are shown in the table below.  Actual maturities will likely differ from these projections because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. 
 
 
December 31, 2015
 
 
Amortized cost
 
Estimated fair value
Maturing in one year or less
 
$
639,396

 
$
663,243

Maturing after one year through five years
 
3,585,421

 
3,779,455

Maturing after five years through ten years
 
5,394,204

 
5,439,202

Maturing after ten years
 
5,126,013

 
5,240,709

Mortgage-backed and asset-backed securities
 
5,262,428

 
5,409,018

Total fixed maturities
 
$
20,007,462

 
$
20,531,627
Summary of information regarding the sales of securities classified as available-for-sale
The following table summarizes information regarding the sales of securities classified as available-for-sale: 
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Proceeds from sales
 
$
4,187,547

 
$
2,705,999

 
$
2,518,568

Gross realized gains from sales
 
47,965

 
47,852

 
71,758

Gross realized losses from sales
 
6,476

 
1,229

 
27,792
Schedule of the carrying value of the mortgage loan portfolio by component
Mortgage loans on real estate - The following table summarizes the carrying value of the mortgage loan portfolio by component: 
 
 
December 31, 2015
 
December 31, 2014
Principal
 
$
3,242,627

 
$
3,356,374

Unamortized premium (discount) and fees, net
 
7,967

 
10,086

Mortgage provision allowance
 
(2,890
)
 
(2,890
)
Total mortgage loans
 
$
3,247,704

 
$
3,363,570
Summary of activity in the mortgage provision allowance
The following table summarizes activity in the mortgage provision allowance: 
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
 
 
Commercial mortgages
 
Commercial mortgages
 
Commercial mortgages
Beginning balance
 
$
2,890

 
$
2,890

 
$
2,890

Provision increases
 
—

 
—

 
273

Charge-off
 
—

 
—

 
(273
)
Recovery
 
—

 
—

 
—

Provision decreases
 
—

 
—

 
—

Ending balance
 
$
2,890

 
$
2,890

 
$
2,890

 
 
 
 
 
 
 
Allowance ending balance by basis of impairment method:
 
 

 
 

 
 

Collectively evaluated for impairment
 
$
2,890

 
$
2,890

 
$
2,890

 
 
 
 
 
 
 
Recorded investment balance in the mortgage loan portfolio, gross of allowance, by basis of impairment method:
 
$
3,250,594

 
$
3,366,460

 
$
3,137,145

Individually evaluated for impairment
 
14,031

 
12,986

 
13,906

Collectively evaluated for impairment
 
3,236,563

 
3,353,474

 
3,123,239
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
The following table summarizes the collateral pledged by the Company under the securities lending program, by class of investment. Under the securities lending program the collateral pledged is, by definition, the securities loaned against the assets borrowed.
 
 
 
 
December 31, 2015
 
December 31, 2014
Securities lending transactions
 
 
 
 
 
 
U.S. government direct obligations and U.S. agencies
 
 
 
$
—

 
$
11,148

Corporate debt securities
 
 
 
—

 
4,275

Total secured borrowings
 
 
 
$
—

 
$
15,423
Schedule of unrealized investment losses, including the non-credit-related portion of OTTI losses reported in AOCI, by class of investment
Unrealized losses on fixed maturity investments classified as available-for-sale - The following tables summarize unrealized investment losses, including the non-credit-related portion of OTTI losses reported in AOCI, by class of investment: 
 
 
December 31, 2015
 
 
Less than twelve months
 
Twelve months or longer
 
Total
 
 
Estimated
 
Unrealized
 
Estimated
 
Unrealized
 
Estimated
 
Unrealized
Fixed maturities:
 
fair value
 
loss and OTTI
 
fair value
 
loss and OTTI
 
fair value
 
loss and OTTI
U.S. government direct obligations and U.S. agencies
 
$
1,357,822

 
$
4,101

 
$
23,604

 
$
507

 
$
1,381,426

 
$
4,608

Obligations of U.S. states and their subdivisions
 
267,581

 
7,903

 
—

 
—

 
267,581

 
7,903

Foreign government securities
 
2,286

 
5

 
—

 
—

 
2,286

 
5

Corporate debt securities
 
4,412,965

 
202,874

 
552,791

 
117,507

 
4,965,756

 
320,381

Asset-backed securities
 
247,082

 
4,372

 
182,404

 
8,990

 
429,486

 
13,362

Residential mortgage-backed securities
 
—

 
—

 
18,625

 
1,508

 
18,625

 
1,508

Commercial mortgage-backed securities
 
429,175

 
11,154

 
44,498

 
375

 
473,673

 
11,529

Collateralized debt obligations
 
9,054

 
58

 
—

 
—

 
9,054

 
58

Total fixed maturities
 
$
6,725,965

 
$
230,467

 
$
821,922

 
$
128,887

 
$
7,547,887

 
$
359,354

Total number of securities in an unrealized loss position
 
 

 
558

 
 

 
106

 
 

 
664

 
 
 
December 31, 2014
 
 
Less than twelve months
 
Twelve months or longer
 
Total
 
 
Estimated
 
Unrealized
 
Estimated
 
Unrealized
 
Estimated
 
Unrealized
Fixed maturities:
 
fair value
 
loss and OTTI
 
fair value
 
loss and OTTI
 
fair value
 
loss and OTTI
U.S. government direct obligations and U.S. agencies
 
$
566,335

 
$
503

 
$
74,322

 
$
991

 
$
640,657

 
$
1,494

Obligations of U.S. states and their subdivisions
 
18,280

 
218

 
41,064

 
681

 
59,344

 
899

Foreign government securities
 
2,451

 
4

 
—

 
—

 
2,451

 
4

Corporate debt securities
 
836,263

 
16,775

 
764,528

 
65,329

 
1,600,791

 
82,104

Asset-backed securities
 
88,312

 
849

 
200,072

 
12,853

 
288,384

 
13,702

Residential mortgage-backed securities
 
4,663

 
11

 
24,052

 
1,921

 
28,715

 
1,932

Commercial mortgage-backed securities
 
35,015

 
127

 
57,333

 
972

 
92,348

 
1,099

Collateralized debt obligations
 
10,465

 
209

 
—

 
—

 
10,465

 
209

Total fixed maturities
 
$
1,561,784

 
$
18,696

 
$
1,161,371

 
$
82,747

 
$
2,723,155

 
$
101,443

Total number of securities in an unrealized loss position
 
 

 
134

 
 

 
153

 
 

 
287
Schedule of OTTI of fixed maturity securities where loss portion is bifurcated and the credit related component recognized in realized investment gains (losses)
Other-than-temporary impairment recognition - The OTTI on fixed maturity securities where the loss portion is bifurcated and the credit related component is recognized in realized investment gains (losses) is summarized as follows: 
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Beginning balance
 
$
119,532

 
$
167,961

 
$
167,788

Additions:
 
 

 
 

 
 

Initial impairments - credit loss on securities not previously impaired
 
759

 
—

 
—

Credit loss recognized on securities previously impaired
 
—

 
—

 
173

Reductions:
 
 

 
 

 
 

Due to sales, maturities, or payoffs during the period
 
(559
)
 
(646
)
 
—

Due to increases in cash flows expected to be collected that are recognized over the remaining life of the security
 
(17,389
)
 
(47,783
)
 
—

Ending balance
 
$
102,343

 
$
119,532

 
$
167,961
Summary of net investment income
The following table summarizes net investment income: 
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Investment income:
 
 

 
 

 
 

Fixed maturity and short-term investments
 
$
796,133

 
$
816,907

 
$
766,367

Mortgage loans on real estate
 
150,284

 
149,497

 
147,944

Policy loans
 
206,081

 
207,013

 
206,718

Limited partnership interests
 
10,462

 
9,128

 
9,131

Net interest on funds withheld balances under reinsurance agreements, related party
 
22,165

 
21,295

 
20,876

Derivative instruments (1)
 
78,655

 
39,533

 
(44,610
)
Other
 
9,228

 
5,008

 
3,321

 
 
1,273,008

 
1,248,381

 
1,109,747

Investment expenses
 
(18,578
)
 
(19,993
)
 
(18,358
)
Net investment income
 
$
1,254,430

 
$
1,228,388

 
$
1,091,389

 

(1) Includes gains (losses) on the hedged asset for fair value hedges.
Summary of realized investment gains (losses)
The following table summarizes realized investment gains (losses): 
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Realized investment gains (losses):
 
 

 
 

 
 

Fixed maturity and short-term investments
 
$
46,027

 
$
54,219

 
$
37,312

Derivative instruments
 
5,840

 
90,504

 
(62,077
)
Mortgage loans on real estate
 
31,841

 
6,857

 
10,895

Other
 
2

 
(4,209
)
 
(266
)
Realized investment gains (losses)
 
$
83,710

 
$
147,371

 
$
(14,136
)
 
Financing Receivable Credit Quality Indicators [Table Text Block]
The following table summarizes the recorded investment of the mortgage loan portfolio by risk assessment category as of December 31, 2015, and 2014, respectively.
 
 
December 31, 2015
 
December 31, 2014
Performing
 
$
3,249,129

 
$
3,366,460

Non-performing
 
1,465

 
—

Total
 
$
3,250,594

 
$
3,366,460