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Investments (Tables) | 3 Months Ended
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Mar. 31, 2017
Investments [Abstract] |
Schedule of Fixed Maturity and Equity Securities | At March 31, 2017 and December 31, 2016, the amortized cost and fair value of fixed maturity securities were as follows:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (Dollars in thousands)
March 31, 2017 |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
Available for sale: |  |  |  |  |  |  |
United States Government full faith and credit | $ | 11,699 |  |  | $ | 225 |  |  | $ | (252 | ) |  | $ | 11,672 |
United States Government sponsored agencies | 1,368,361 |  |  | 25,803 |  |  | (53,376 | ) |  | 1,340,788 |
United States municipalities, states and territories | 3,673,722 |  |  | 334,483 |  |  | (18,903 | ) |  | 3,989,302 |
Foreign government obligations | 228,998 |  |  | 12,047 |  |  | (2,647 | ) |  | 238,398 |
Corporate securities | 27,149,697 |  |  | 1,289,415 |  |  | (278,492 | ) |  | 28,160,620 |
Residential mortgage backed securities | 1,119,318 |  |  | 84,885 |  |  | (4,163 | ) |  | 1,200,040 |
Commercial mortgage backed securities | 5,406,475 |  |  | 65,691 |  |  | (88,224 | ) |  | 5,383,942 |
Other asset backed securities | 1,759,463 |  |  | 35,537 |  |  | (14,396 | ) |  | 1,780,604 |
| $ | 40,717,733 |  |  | $ | 1,848,086 |  |  | $ | (460,453 | ) |  | $ | 42,105,366 |
Held for investment: |  |  |  |  |  |  |
Corporate security | $ | 76,878 |  |  | $ | — |  |  | $ | (6,083 | ) |  | $ | 70,795 |
Other investments: equity securities, available for sale: |  |  |  |  |  |  |
Finance, insurance, and real estate | $ | 7,524 |  |  | $ | 466 |  |  | $ | — |  |  | $ | 7,990 |
December 31, 2016 |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
Available for sale: |  |  |  |  |  |  |
United States Government full faith and credit | $ | 11,864 |  |  | $ | 229 |  |  | $ | (288 | ) |  | $ | 11,805 |
United States Government sponsored agencies | 1,368,340 |  |  | 23,360 |  |  | (46,913 | ) |  | 1,344,787 |
United States municipalities, states and territories | 3,626,395 |  |  | 322,948 |  |  | (22,393 | ) |  | 3,926,950 |
Foreign government obligations | 229,589 |  |  | 11,832 |  |  | (5,080 | ) |  | 236,341 |
Corporate securities | 26,333,213 |  |  | 1,149,978 |  |  | (368,773 | ) |  | 27,114,418 |
Residential mortgage backed securities | 1,166,944 |  |  | 91,445 |  |  | (3,554 | ) |  | 1,254,835 |
Commercial mortgage backed securities | 5,422,255 |  |  | 59,994 |  |  | (117,014 | ) |  | 5,365,235 |
Other asset backed securities | 1,795,355 |  |  | 31,471 |  |  | (20,703 | ) |  | 1,806,123 |
| $ | 39,953,955 |  |  | $ | 1,691,257 |  |  | $ | (584,718 | ) |  | $ | 41,060,494 |
Held for investment: |  |  |  |  |  |  |
Corporate security | $ | 76,825 |  |  | $ | — |  |  | $ | (8,059 | ) |  | $ | 68,766 |
Other investments: equity securities, available for sale: |  |  |  |  |  |  |
Finance, insurance, and real estate | $ | 7,521 |  |  | $ | 479 |  |  | $ | — |  |  | $ | 8,000 |
Schedule of Fixed Maturity Securities by Contractual Maturity Date | The amortized cost and fair value of fixed maturity securities at March 31, 2017, 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 | $ | 250,055 |  |  | $ | 255,489 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 3,018,037 |  |  | 3,173,708 |  |  | — |  |  | — |
Due after five years through ten years | 11,869,326 |  |  | 12,056,727 |  |  | — |  |  | — |
Due after ten years through twenty years | 8,834,516 |  |  | 9,391,491 |  |  | — |  |  | — |
Due after twenty years | 8,460,543 |  |  | 8,863,365 |  |  | 76,878 |  |  | 70,795 |
| 32,432,477 |  |  | 33,740,780 |  |  | 76,878 |  |  | 70,795 |
Residential mortgage backed securities | 1,119,318 |  |  | 1,200,040 |  |  | — |  |  | — |
Commercial mortgage backed securities | 5,406,475 |  |  | 5,383,942 |  |  | — |  |  | — |
Other asset backed securities | 1,759,463 |  |  | 1,780,604 |  |  | — |  |  | — |
| $ | 40,717,733 |  |  | $ | 42,105,366 |  |  | $ | 76,878 |  |  | $ | 70,795 |
Schedule of Components of Net Unrealized Gains on Available for Sale Fixed Maturity and Equity Securities Reported as Separate Component of Stockholders' Equity | 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:
| March 31, 2017 |  | December 31, 2016
| (Dollars in thousands)
Net unrealized gains on available for sale fixed maturity securities and equity securities | $ | 1,388,099 |  |  | $ | 1,107,018 |
Adjustments for assumed changes in amortization of deferred policy acquisition costs and deferred sales inducements | (769,623 | ) |  | (618,661 | )
Deferred income tax valuation allowance reversal | 22,534 |  |  | 22,534 |
Deferred income tax expense | (216,467 | ) |  | (170,925 | )
Net unrealized gains reported as accumulated other comprehensive income | $ | 424,543 |  |  | $ | 339,966 |
Schedule of Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation | The following table summarizes the credit quality, as determined by NAIC designation, of our fixed maturity portfolio as of the dates indicated:
|  | March 31, 2017 |  | December 31, 2016
NAIC Designation |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
|  | (Dollars in thousands)
1 |  | $ | 25,850,507 |  |  | $ | 26,875,133 |  |  | $ | 25,607,268 |  |  | $ | 26,507,798 |
2 |  | 13,612,067 |  |  | 14,013,896 |  |  | 13,037,592 |  |  | 13,295,648 |
3 |  | 1,187,828 |  |  | 1,151,654 |  |  | 1,201,059 |  |  | 1,155,702 |
4 |  | 111,827 |  |  | 104,462 |  |  | 154,226 |  |  | 137,188 |
5 |  | 19,537 |  |  | 21,840 |  |  | 17,475 |  |  | 24,664 |
6 |  | 12,845 |  |  | 9,176 |  |  | 13,160 |  |  | 8,260 |
|  | $ | 40,794,611 |  |  | $ | 42,176,161 |  |  | $ | 40,030,780 |  |  | $ | 41,129,260 |
Schedule of Gross Unrealized Losses on Investments, By Category and Length of Time | The following table shows our investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities (consisting of 1,233 and 1,514 securities, respectively) have been in a continuous unrealized loss position, at March 31, 2017 and December 31, 2016:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (Dollars in thousands)
March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |
Available for sale: |  |  |  |  |  |  |  |  |  |  |
United States Government full faith and credit | $ | 7,275 |  |  | $ | (252 | ) |  | $ | — |  |  | $ | — |  |  | $ | 7,275 |  |  | $ | (252 | )
United States Government sponsored agencies | 989,089 |  |  | (53,376 | ) |  | — |  |  | — |  |  | 989,089 |  |  | (53,376 | )
United States municipalities, states and territories | 367,378 |  |  | (18,903 | ) |  | — |  |  | — |  |  | 367,378 |  |  | (18,903 | )
Foreign government obligations | 24,941 |  |  | (147 | ) |  | 11,844 |  |  | (2,500 | ) |  | 36,785 |  |  | (2,647 | )
Corporate securities: |  |  |  |  |  |  |  |  |  |  |
Finance, insurance and real estate | 1,443,090 |  |  | (52,452 | ) |  | 109,375 |  |  | (8,578 | ) |  | 1,552,465 |  |  | (61,030 | )
Manufacturing, construction and mining | 721,674 |  |  | (20,261 | ) |  | 210,686 |  |  | (15,139 | ) |  | 932,360 |  |  | (35,400 | )
Utilities and related sectors | 1,342,397 |  |  | (33,268 | ) |  | 53,702 |  |  | (4,018 | ) |  | 1,396,099 |  |  | (37,286 | )
Wholesale/retail trade | 596,682 |  |  | (21,288 | ) |  | 29,917 |  |  | (1,691 | ) |  | 626,599 |  |  | (22,979 | )
Services, media and other | 1,874,016 |  |  | (61,940 | ) |  | 640,141 |  |  | (59,857 | ) |  | 2,514,157 |  |  | (121,797 | )
Residential mortgage backed securities | 81,636 |  |  | (3,406 | ) |  | 8,197 |  |  | (757 | ) |  | 89,833 |  |  | (4,163 | )
Commercial mortgage backed securities | 2,732,202 |  |  | (88,183 | ) |  | 931 |  |  | (41 | ) |  | 2,733,133 |  |  | (88,224 | )
Other asset backed securities | 555,010 |  |  | (6,660 | ) |  | 108,450 |  |  | (7,736 | ) |  | 663,460 |  |  | (14,396 | )
| $ | 10,735,390 |  |  | $ | (360,136 | ) |  | $ | 1,173,243 |  |  | $ | (100,317 | ) |  | $ | 11,908,633 |  |  | $ | (460,453 | )
Held for investment: |  |  |  |  |  |  |  |  |  |  |
Corporate security: |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | — |  |  | $ | — |  |  | $ | 70,795 |  |  | $ | (6,083 | ) |  | $ | 70,795 |  |  | $ | (6,083 | )
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |
Available for sale: |  |  |  |  |  |  |  |  |  |  |
United States Government full faith and credit | $ | 7,405 |  |  | $ | (288 | ) |  | $ | — |  |  | $ | — |  |  | $ | 7,405 |  |  | $ | (288 | )
United States Government sponsored agencies | 995,548 |  |  | (46,913 | ) |  | — |  |  | — |  |  | 995,548 |  |  | (46,913 | )
United States municipalities, states and territories | 463,409 |  |  | (22,393 | ) |  | — |  |  | — |  |  | 463,409 |  |  | (22,393 | )
Foreign government obligations | 29,158 |  |  | (913 | ) |  | 20,388 |  |  | (4,167 | ) |  | 49,546 |  |  | (5,080 | )
Corporate securities: |  |  |  |  |  |  |  |  |  |  |
Finance, insurance and real estate | 1,940,107 |  |  | (70,421 | ) |  | 82,907 |  |  | (7,723 | ) |  | 2,023,014 |  |  | (78,144 | )
Manufacturing, construction and mining | 1,199,420 |  |  | (34,304 | ) |  | 311,591 |  |  | (23,273 | ) |  | 1,511,011 |  |  | (57,577 | )
Utilities and related sectors | 1,401,650 |  |  | (45,015 | ) |  | 58,597 |  |  | (5,820 | ) |  | 1,460,247 |  |  | (50,835 | )
Wholesale/retail trade | 637,121 |  |  | (18,880 | ) |  | 29,719 |  |  | (1,930 | ) |  | 666,840 |  |  | (20,810 | )
Services, media and other | 2,539,519 |  |  | (82,196 | ) |  | 716,857 |  |  | (79,211 | ) |  | 3,256,376 |  |  | (161,407 | )
Residential mortgage backed securities | 81,762 |  |  | (3,463 | ) |  | 1,853 |  |  | (91 | ) |  | 83,615 |  |  | (3,554 | )
Commercial mortgage backed securities | 3,148,395 |  |  | (116,938 | ) |  | 895 |  |  | (76 | ) |  | 3,149,290 |  |  | (117,014 | )
Other asset backed securities | 751,533 |  |  | (12,289 | ) |  | 146,167 |  |  | (8,414 | ) |  | 897,700 |  |  | (20,703 | )
| $ | 13,195,027 |  |  | $ | (454,013 | ) |  | $ | 1,368,974 |  |  | $ | (130,705 | ) |  | $ | 14,564,001 |  |  | $ | (584,718 | )
Held for investment: |  |  |  |  |  |  |  |  |  |  |
Corporate security: |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | — |  |  | $ | — |  |  | $ | 68,766 |  |  | $ | (8,059 | ) |  | $ | 68,766 |  |  | $ | (8,059 | )
Schedule of Changes in Net Unrealized Gains/Losses on Investments | Changes in net unrealized gains on investments for the three months ended March 31, 2017 and 2016 are as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
| (Dollars in thousands)
Fixed maturity securities held for investment carried at amortized cost | $ | (1,976 | ) |  | $ | 2,245 |
Investments carried at fair value: |  |  |
Fixed maturity securities, available for sale | $ | 281,094 |  |  | $ | 1,115,085 |
Equity securities, available for sale | (13 | ) |  | (17 | )
| 281,081 |  |  | 1,115,068 |
Adjustment for effect on other balance sheet accounts: |  |  |
Deferred policy acquisition costs and deferred sales inducements | (150,962 | ) |  | (609,751 | )
Deferred income tax asset/liability | (45,542 | ) |  | (176,861 | )
| (196,504 | ) |  | (786,612 | )
Change in net unrealized gains on investments carried at fair value | $ | 84,577 |  |  | $ | 328,456 |
Net Realized Gains (Losses) on Investments | Net realized gains on investments, excluding net OTTI losses for the three months ended March 31, 2017 and 2016, are as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
| (Dollars in thousands)
Available for sale fixed maturity securities: |  |  |
Gross realized gains | $ | 5,572 |  |  | $ | 1,487 |
Gross realized losses | (3,563 | ) |  | (1,231 | )
| 2,009 |  |  | 256 |
Other investments: |  |  |
Gain on sale of real estate | 29 |  |  | 131 |
Loss on sale of real estate | — |  |  | (92 | )
| 29 |  |  | 39 |
Mortgage loans on real estate: |  |  |
Decrease (increase) in allowance for credit losses | 300 |  |  | (948 | )
Recovery of specific allowance | — |  |  | 3,340 |
| 300 |  |  | 2,392 |
| $ | 2,338 |  |  | $ | 2,687 |
Significant Assumptions Used to Determine the Credit Loss Component of Other Than Temporary Impairment on Residential Mortgage Backed Securities | The following table presents the range of significant assumptions used to determine the credit loss component of other than temporary impairments we have recognized on residential mortgage backed securities for the three months ended March 31, 2017 and 2016, which are all senior level tranches within the structure of the securities:
|  |  |  | Discount Rate |  | Default Rate |  | Loss Severity
Sector |  | Vintage |  | Min |  | Max |  | Min |  | Max |  | Min |  | Max
Three months ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prime |  | 2005 |  | 7.7 | % |  | 7.7 | % |  | 8 | % |  | 8 | % |  | 50 | % |  | 50 | %
|  | 2007 |  | 6.2 | % |  | 6.3 | % |  | 15 | % |  | 18 | % |  | 50 | % |  | 60 | %
Three months ended March 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prime |  | 2006 |  | 7.3 | % |  | 7.3 | % |  | 13 | % |  | 13 | % |  | 50 | % |  | 50 | %
|  | 2007 |  | 6.2 | % |  | 6.4 | % |  | 18 | % |  | 31 | % |  | 50 | % |  | 55 | %
Other Than Temporary Impairment by Asset Type | The following table summarizes other than temporary impairments for the three months ended March 31, 2017 and 2016, by asset type:
| Number of Securities |  | Total OTTI Losses |  | Portion of OTTI Losses Recognized in (from) Other Comprehensive Income |  | Net OTTI Losses Recognized in Operations
|  |  | (Dollars in thousands)
Three months ended March 31, 2017 |  |  |  |  |  |  |
Fixed maturity securities, available for sale: |  |  |  |  |  |  |
Residential mortgage backed securities | 3 |  |  | $ | — |  |  | $ | (141 | ) |  | $ | (141 | )
Three months ended March 31, 2016 |  |  |  |  |  |  |
Fixed maturity securities, available for sale: |  |  |  |  |  |  |
Corporate securities: |  |  |  |  |  |  |
Energy | 2 |  |  | $ | (642 | ) |  | $ | — |  |  | $ | (642 | )
Telecommunications | 1 |  |  | (4,462 | ) |  | 562 |  |  | (3,900 | )
Utilities | 1 |  |  | (136 | ) |  | — |  |  | (136 | )
Residential mortgage backed securities | 4 |  |  | — |  |  | (238 | ) |  | (238 | )
Commercial mortgage backed securities | 3 |  |  | (778 | ) |  | — |  |  | (778 | )
| 11 |  |  | $ | (6,018 | ) |  | $ | 324 |  |  | $ | (5,694 | )
Other Than Temporary Impairment, Credit Losses Recognized in Earnings | 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 March 31,
| 2017 |  | 2016
| (Dollars in thousands)
Cumulative credit loss at beginning of period | $ | (166,375 | ) |  | $ | (145,824 | )
Credit losses on securities for which OTTI has not previously been recognized | — |  |  | (5,456 | )
Additional credit losses on securities for which OTTI has previously been recognized | (141 | ) |  | (238 | )
Accumulated losses on securities that were disposed of during the period | 13,939 |  |  | — |
Cumulative credit loss at end of period | $ | (152,577 | ) |  | $ | (151,518 | )
Schedule of Other Than Temporary Impairment Losses, Investments | The following table summarizes the cumulative noncredit portion of OTTI and the change in fair value since recognition of OTTI, both of which were recognized in other comprehensive income, by major type of security, for securities that are part of our investment portfolio at March 31, 2017 and December 31, 2016:
| Amortized Cost |  | OTTI Recognized in Other Comprehensive Income |  | Change in Fair Value Since OTTI was Recognized |  | Fair Value
| (Dollars in thousands)
March 31, 2017 |  |  |  |  |  |  |
Fixed maturity securities, available for sale: |  |  |  |  |  |  |
Corporate securities | $ | 10,496 |  |  | $ | (4,263 | ) |  | $ | 10,356 |  |  | $ | 16,589 |
Residential mortgage backed securities | 347,911 |  |  | (169,799 | ) |  | 198,785 |  |  | 376,897 |
Other asset backed securities | 4,854 |  |  | (1,643 | ) |  | (1,859 | ) |  | 1,352 |
| $ | 363,261 |  |  | $ | (175,705 | ) |  | $ | 207,282 |  |  | $ | 394,838 |
December 31, 2016 |  |  |  |  |  |  |
Fixed maturity securities, available for sale: |  |  |  |  |  |  |
Corporate securities | $ | 17,549 |  |  | $ | (5,910 | ) |  | $ | 13,566 |  |  | $ | 25,205 |
Residential mortgage backed securities | 368,862 |  |  | (169,941 | ) |  | 205,854 |  |  | 404,775 |
Commercial mortgage backed securities | 6,596 |  |  | — |  |  | (107 | ) |  | 6,489 |
Other asset backed securities | 6,683 |  |  | (1,643 | ) |  | (1,566 | ) |  | 3,474 |
| $ | 399,690 |  |  | $ | (177,494 | ) |  | $ | 217,747 |  |  | $ | 439,943 |

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- Definition Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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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=50485924&loc=d3e611225-123010 + Details
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