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Investments (Tables) | 6 Months Ended
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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 | )

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- Definition Tabular disclosure of the summary of investment holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Article 12 + Details
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