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Investments (Tables)
 6 Months Ended
Jun. 30, 2013
Investments [Abstract]  
Schedule of Components of Net Unrealized Gain or Loss on Availabe-for-sale Fixed Maturity and Equity Securities Reported as Seperate Component of Stockholders' Equity [Table Text Block]
Net unrealized gains on available for sale fixed maturity securities and equity securities reported as a separate component of stockholders' equity were comprised of the following:
 
June 30,
2013
 
December 31,
2012
 
(Dollars in thousands)
Net unrealized gains on available for sale fixed maturity securities and equity securities
$
757,430

 
$
2,223,933

Adjustments for assumed changes in amortization of deferred policy acquisition costs and deferred sales inducements
(416,281
)
 
(1,201,974
)
Deferred income tax valuation allowance reversal
22,534

 
22,534

Deferred income tax benefit
(119,403
)
 
(357,686
)
Net unrealized gains reported as accumulated other comprehensive income
$
244,280

 
$
686,807
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
The following tables show our investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities (consisting of 803 and 198 securities, respectively) have been in a continuous unrealized loss position, at June 30, 2013 and December 31, 2012:
 
Less than 12 months
 
12 months or more
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
(Dollars in thousands)
June 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
United States Government full faith and credit
$
984

 
$
(36
)
 
$
—

 
$
—

 
$
984

 
$
(36
)
United States Government sponsored agencies
1,126,107

 
(46,847
)
 
—

 
—

 
1,126,107

 
(46,847
)
United States municipalities, states and territories
407,748

 
(24,701
)
 
—

 
—

 
407,748

 
(24,701
)
Foreign government obligations
27,269

 
(2,525
)
 
—

 
—

 
27,269

 
(2,525
)
Corporate securities:
 
 
 
 
 
 
 
 
 
 
 
Finance, insurance and real estate
1,295,619

 
(67,115
)
 
84,262

 
(7,814
)
 
1,379,881

 
(74,929
)
Manufacturing, construction and mining
2,631,633

 
(135,270
)
 
12,079

 
(1,797
)
 
2,643,712

 
(137,067
)
Utilities and related sectors
1,334,828

 
(64,359
)
 
29,728

 
(3,728
)
 
1,364,556

 
(68,087
)
Wholesale/retail trade
301,898

 
(17,027
)
 
—

 
—

 
301,898

 
(17,027
)
Services, media and other
747,156

 
(39,559
)
 
—

 
—

 
747,156

 
(39,559
)
Residential mortgage backed securities
293,301

 
(13,905
)
 
58,100

 
(2,488
)
 
351,401

 
(16,393
)
Commercial mortgage backed securities
1,064,758

 
(83,053
)
 
—

 
—

 
1,064,758

 
(83,053
)
Other asset backed securities
426,195

 
(16,816
)
 
22,823

 
(3,347
)
 
449,018

 
(20,163
)
 
$
9,657,496

 
$
(511,213
)
 
$
206,992

 
$
(19,174
)
 
$
9,864,488

 
$
(530,387
)
Held for investment:
 
 
 
 
 
 
 
 
 
 
 
Corporate security:
 
 
 
 
 
 
 
 
 
 
 
Insurance
$
—

 
$
—

 
$
61,250

 
$
(14,920
)
 
$
61,250

 
$
(14,920
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
United States Government sponsored agencies
$
973,728

 
$
(3,468
)
 
$
—

 
$
—

 
$
973,728

 
$
(3,468
)
United States municipalities, states and territories
24,393

 
(125
)
 
—

 
—

 
24,393

 
(125
)
Corporate securities:
 
 
 
 
 
 
 
 
 
 
 
Finance, insurance and real estate
177,962

 
(4,126
)
 
85,709

 
(8,438
)
 
263,671

 
(12,564
)
Manufacturing, construction and mining
426,120

 
(4,303
)
 
21,975

 
(1,281
)
 
448,095

 
(5,584
)
Utilities and related sectors
221,044

 
(5,187
)
 
39,224

 
(4,212
)
 
260,268

 
(9,399
)
Wholesale/retail trade
101,790

 
(784
)
 
10,250

 
(208
)
 
112,040

 
(992
)
Services, media and other
264,421

 
(3,085
)
 
—

 
—

 
264,421

 
(3,085
)
Residential mortgage backed securities
220,622

 
(8,679
)
 
260,226

 
(19,049
)
 
480,848

 
(27,728
)
Commercial mortgage backed securities
161,582

 
(1,983
)
 
—

 
—

 
161,582

 
(1,983
)
Other asset backed securities
145,238

 
(2,242
)
 
26,131

 
(731
)
 
171,369

 
(2,973
)
 
$
2,716,900

 
$
(33,982
)
 
$
443,515

 
$
(33,919
)
 
$
3,160,415

 
$
(67,901
)
Held for investment:
 
 
 
 
 
 
 
 
 
 
 
Corporate security:
 
 
 
 
 
 
 
 
 
 
 
Insurance
$
—

 
$
—

 
$
61,521

 
$
(14,567
)
 
$
61,521

 
$
(14,567
)
 
 
 
 
 
 
 
 
 
 
 
 
Equity security, available for sale:
 
 
 
 
 
 
 
 
 
 
 
Services
$
—

 
$
—

 
$
8,722

 
$
(1,403
)
 
$
8,722

 
$
(1,403
)
Realized Gain (Loss) on Investments [Table Text Block]
Realized gains and losses on sales are determined on the basis of specific identification of investments based on the trade date. Net realized gains (losses) on investments, excluding net OTTI losses for the three and six months ended June 30, 2013 and 2012 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
 
(Dollars in thousands)
Available for sale fixed maturity securities:
 
 
 
 
 
 
 
Gross realized gains
$
7,628

 
$
4,030

 
$
20,643

 
$
5,048

Gross realized losses
(823
)
 
(59
)
 
(3,010
)
 
(355
)
 
6,805

 
3,971

 
17,633

 
4,693

Equity securities:
 
 
 
 
 
 
 
Gross realized gains
9,571

 
—

 
9,571

 
562

Other investments:
 
 
 
 
 
 
 
Gain on sale of real estate
715

 
1,450

 
1,304

 
2,895

Loss on sale of real estate
—

 
—

 
(466
)
 
—

Impairment losses on real estate
(145
)
 
(1,669
)
 
(145
)
 
(2,643
)
 
570

 
(219
)
 
693

 
252

Mortgage loans on real estate:
 
 
 
 
 
 
 
Increase in allowance for credit losses
(1,257
)
 
(4,363
)
 
(1,623
)
 
(12,194
)
 
$
15,689

 
$
(611
)
 
$
26,274

 
$
(6,687
)
Schedule of Unrealized Loss on Investments [Table Text Block]
Changes in net unrealized gains on investments for the three and six months ended June 30, 2013 and 2012 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
(Dollars in thousands)
Fixed maturity securities held for investment carried at amortized cost
$
(964
)
 
$
1,690

 
$
(353
)
 
$
11,879

Investments carried at fair value:
 
 
 
 
 
 
 
Fixed maturity securities, available for sale
$
(1,339,484
)
 
$
603,462

 
$
(1,458,554
)
 
$
388,374

Equity securities, available for sale
(10,168
)
 
(787
)
 
(7,949
)
 
3,637

 
(1,349,652
)
 
602,675

 
(1,466,503
)
 
392,011

Adjustment for effect on other balance sheet accounts:
 
 
 
 
 
 
 
Deferred policy acquisition costs and deferred sales inducements
707,525

 
(339,408
)
 
785,693

 
(203,330
)
Deferred income tax asset/liability
224,744

 
(92,142
)
 
238,283

 
(66,038
)
 
932,269

 
(431,550
)
 
1,023,976

 
(269,368
)
Change in net unrealized gains on investments carried at fair value
$
(417,383
)
 
$
171,125

 
$
(442,527
)
 
$
122,643
Schedule of Credit Quality of Fixed Maturity Security Portfolio by NAIC Designatio [Table Text Block]
The following table summarizes the credit quality, as determined by NAIC designation, of our fixed maturity portfolio as of the dates indicated:
 
 
June 30, 2013
 
December 31, 2012
NAIC
Designation
 
Amortized Cost

 
Fair Value
 
Amortized Cost
 
Fair Value
 
 
(Dollars in thousands)
1
 
$
15,440,564

 
$
16,049,276

 
$
13,737,381

 
$
15,250,560

2
 
8,878,184

 
9,028,631

 
7,838,186

 
8,533,121

3
 
475,652

 
457,918

 
398,294

 
387,222

4
 
68,807

 
69,502

 
53,879

 
56,151

5
 
—

 
—

 
—

 
—

6
 
2,050

 
1,565

 
5,375

 
6,603

 
 
$
24,865,257

 
$
25,606,892

 
$
22,033,115

 
$
24,233,657
Investments Classified by Contractual Maturity Date [Table Text Block]
The amortized cost and fair value of fixed maturity securities at June 30, 2013, by contractual maturity, are shown below. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. All of our mortgage and other asset backed securities provide for periodic payments throughout their lives and are shown below as separate lines.
 
Available for sale
 
Held for investment
 
Amortized
Cost
 
Fair Value
 
Amortized
Cost
 
Fair Value
 
(Dollars in thousands)
Due in one year or less
$
113,074

 
$
116,889

 
$
—

 
$
—

Due after one year through five years
840,609

 
941,104

 
—

 
—

Due after five years through ten years
6,802,325

 
6,819,438

 
—

 
—

Due after ten years through twenty years
5,829,419

 
6,033,288

 
—

 
—

Due after twenty years
6,574,671

 
6,929,362

 
76,170

 
61,250

 
20,160,098

 
20,840,081

 
76,170

 
61,250

Residential mortgage backed securities
2,337,399

 
2,488,057

 
—

 
—

Commercial mortgage backed securities
1,304,028

 
1,222,689

 
—

 
—

Other asset backed securities
987,562

 
994,815

 
—

 
—

 
$
24,789,087

 
$
25,545,642

 
$
76,170

 
$
61,250
Schedule of Available for Sale and Held for Investment Securites Reconciliation [Table Text Block]
At June 30, 2013 and December 31, 2012, the amortized cost and fair value of fixed maturity securities and equity securities were as follows:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(Dollars in thousands)
June 30, 2013
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
United States Government full faith and credit
$
4,607

 
$
367

 
$
(36
)
 
$
4,938

United States Government sponsored agencies
1,241,898

 
4,796

 
(46,847
)
 
1,199,847

United States municipalities, states and territories
3,299,732

 
268,127

 
(24,701
)
 
3,543,158

Foreign government obligations
86,106

 
9,230

 
(2,525
)
 
92,811

Corporate securities
15,527,755

 
808,241

 
(336,669
)
 
15,999,327

Residential mortgage backed securities
2,337,399

 
167,051

 
(16,393
)
 
2,488,057

Commercial mortgage backed securities
1,304,028

 
1,714

 
(83,053
)
 
1,222,689

Other asset backed securities
987,562

 
27,416

 
(20,163
)
 
994,815

 
$
24,789,087

 
$
1,286,942

 
$
(530,387
)
 
$
25,545,642

Held for investment:
 
 
 
 
 
 
 
Corporate security
$
76,170

 
$
—

 
$
(14,920
)
 
$
61,250

 
 
 
 
 
 
 
 
Equity securities, available for sale:
 
 
 
 
 
 
 
Finance, insurance, and real estate
$
8,915

 
$
875

 
$
—

 
$
9,790

 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
United States Government full faith and credit
$
4,590

 
$
564

 
$
—

 
$
5,154

United States Government sponsored agencies
1,763,789

 
11,704

 
(3,468
)
 
1,772,025

United States municipalities, states and territories
3,116,678

 
461,770

 
(125
)
 
3,578,323

Foreign government obligations
86,099

 
19,160

 
—

 
105,259

Corporate securities
12,930,173

 
1,568,223

 
(31,624
)
 
14,466,772

Residential mortgage backed securities
2,743,537

 
172,304

 
(27,728
)
 
2,888,113

Commercial mortgage backed securities
354,870

 
5,095

 
(1,983
)
 
357,982

Other asset backed securities
957,291

 
44,190

 
(2,973
)
 
998,508

 
$
21,957,027

 
$
2,283,010

 
$
(67,901
)
 
$
24,172,136

Held for investment:
 
 
 
 
 
 
 
Corporate security
$
76,088

 
$
—

 
$
(14,567
)
 
$
61,521

 
 
 
 
 
 
 
 
Equity securities, available for sale:
 
 
 
 
 
 
 
Finance, insurance, and real estate
$
44,598

 
$
10,227

 
$
(1,403
)
 
$
53,422
Other Than Temporary Impairment by Asset Type [Table Text Block]
The following table summarizes other than temporary impairments for the three and six months ended June 30, 2013 and 2012, by asset type:
 
Number
of
Securities

 
Total OTTI
Losses

 
Portion of OTTI Losses Recognized from Other Comprehensive Income
 
Net OTTI Losses
Recognized in Operations

 
 
 
(Dollars in thousands)
Three months ended June 30, 2013
 
 
 
 
 
 
 
Fixed maturity securities, available for sale:
 
 
 
 
 
 
 
United States Government sponsored agencies
2

 
$
(2,775
)
 
$
—

 
$
(2,775
)
 
 
 
 
 
 
 
 
Three months ended June 30, 2012
 
 
 
 
 
 
 
Fixed maturity securities, available for sale:
 
 
 
 
 
 
 
Residential mortgage backed securities
7

 
$
(375
)
 
$
(603
)
 
$
(978
)
 
 
 
 
 
 
 
 
Six months ended June 30, 2013
 
 
 
 
 
 
 
Fixed maturity securities, available for sale:
 
 
 
 
 
 
 
United States Government sponsored agencies
2

 
$
(2,775
)
 
$
—

 
$
(2,775
)
Corporate securities:
 
 
 
 
 
 
 
Industrial
1

 
(1,761
)
 
—

 
(1,761
)
Residential mortgage backed securities
5

 
—

 
(1,048
)
 
(1,048
)
Equity security, available for sale:
 
 
 
 
 
 
 
Industrial
1

 
(428
)
 
—

 
(428
)
 
9

 
$
(4,964
)
 
$
(1,048
)
 
$
(6,012
)
Six months ended June 30, 2012
 
 
 
 
 
 
 
Fixed maturity securities, available for sale:
 
 
 
 
 
 
 
Residential mortgage backed securities
22

 
$
(2,156
)
 
$
(1,703
)
 
$
(3,859
)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
The cumulative portion of other than temporary impairments determined to be credit losses which have been recognized in operations for debt securities are summarized as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
 
(Dollars in thousands)
Cumulative credit loss at beginning of period
$
(129,813
)
 
$
(121,976
)
 
$
(134,027
)
 
$
(119,095
)
Credit losses on securities for which OTTI has not previously been recognized
(2,775
)
 
(47
)
 
(4,536
)
 
(47
)
Additional credit losses on securities for which OTTI has previously been recognized
—

 
(931
)
 
(1,048
)
 
(3,812
)
Accumulated losses on securities that were disposed of during the period
4,075

 
—

 
11,098

 
—

Cumulative credit loss at end of period
$
(128,513
)
 
$
(122,954
)
 
$
(128,513
)
 
$
(122,954
)