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Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income | The following tables detail the changes in the balances of each component of accumulated other comprehensive income for the affected periods:
|  | Unrealized Gains (Losses) on Available for Sale Securities (1) |  | Amortization of Postretirement Benefit (1) |  | Gain (Loss) on Foreign Currency Translation (1) |  | Credit Risk Changes of Fair Value Option Liabilities (1) (2) |  | Total
Three Months Ended June 30, 2018: |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 153,059 |  |  | $ | 9,781 |  |  | $ | (61,578 | ) |  | $ | (1,786 | ) |  | $ | 99,476 |
Other comprehensive income (loss) before reclassifications |  | 46,709 |  |  | — |  |  | (52,989 | ) |  | — |  |  | (6,280 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  | (46,134 | ) |  | (302 | ) |  | — |  |  | (906 | ) |  | (47,342 | )
Net current period other comprehensive income (loss) |  | 575 |  |  | (302 | ) |  | (52,989 | ) |  | (906 | ) |  | (53,622 | )
Balance at June 30, 2018 |  | $ | 153,634 |  |  | $ | 9,479 |  |  | $ | (114,567 | ) |  | $ | (2,692 | ) |  | $ | 45,854 |
Three Months Ended June 30, 2017: |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 140,198 |  |  | $ | 11,654 |  |  | $ | (154,627 | ) |  | $ | — |  |  | $ | (2,775 | )
Other comprehensive income (loss) before reclassifications |  | 15,070 |  |  | — |  |  | 29,292 |  |  | — |  |  | 44,362 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | (2,421 | ) |  | (338 | ) |  | — |  |  | — |  |  | (2,759 | )
Net current period other comprehensive income (loss) |  | 12,649 |  |  | (338 | ) |  | 29,292 |  |  | — |  |  | 41,603 |
Balance at June 30, 2017 |  | $ | 152,847 |  |  | $ | 11,316 |  |  | $ | (125,335 | ) |  | $ | — |  |  | $ | 38,828 |
Six Months Ended June 30, 2018: |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 30,755 |  |  | $ | 10,640 |  |  | $ | (93,634 | ) |  | $ | — |  |  | $ | (52,239 | )
Adjustment to opening balance, net of taxes (3) |  | — |  |  | — |  |  | — |  |  | (2,900 | ) |  | (2,900 | )
Adjusted balance, beginning of period |  | 30,755 |  |  | 10,640 |  |  | (93,634 | ) |  | (2,900 | ) |  | (55,139 | )
Other comprehensive income (loss) before reclassifications |  | 173,576 |  |  | (556 | ) |  | (20,933 | ) |  | — |  |  | 152,087 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | (50,697 | ) |  | (605 | ) |  | — |  |  | 208 |  |  | (51,094 | )
Net current period other comprehensive income (loss) |  | 122,879 |  |  | (1,161 | ) |  | (20,933 | ) |  | 208 |  |  | 100,993 |
Balance at June 30, 2018 |  | $ | 153,634 |  |  | $ | 9,479 |  |  | $ | (114,567 | ) |  | $ | (2,692 | ) |  | $ | 45,854 |
Six Months Ended June 30, 2017: |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 118,863 |  |  | $ | 9,367 |  |  | $ | (167,220 | ) |  | $ | — |  |  | $ | (38,990 | )
Other comprehensive income (loss) before reclassifications |  | 27,570 |  |  | 2,625 |  |  | 41,885 |  |  | — |  |  | 72,080 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | 6,414 |  |  | (676 | ) |  | — |  |  | — |  |  | 5,738 |
Net current period other comprehensive income (loss) |  | 33,984 |  |  | 1,949 |  |  | 41,885 |  |  | — |  |  | 77,818 |
Balance at June 30, 2017 |  | $ | 152,847 |  |  | $ | 11,316 |  |  | $ | (125,335 | ) |  | $ | — |  |  | $ | 38,828 |
(1) | All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income.
Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income | The following table details the significant amounts reclassified from each component of accumulated other comprehensive income, shown in the above rollforward tables, for the affected periods:
Details about Accumulated Other Comprehensive Income Components |  | Amount Reclassified from Accumulated Other Comprehensive Income (1) |  | Affected Line Item in the Consolidated Statement of Total Comprehensive Income (Loss)
| Three Months Ended June 30, |
| 2018 |  | 2017 |
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |  |
|  | $ | (47,256 | ) |  | $ | (2,421 | ) |  | Net realized investment gains (losses) and other-than-temporary impairment losses
|  | 1,122 |  |  | — |  |  | Provision for income taxes
|  | $ | (46,134 | ) |  | $ | (2,421 | ) |  | Net of tax and noncontrolling interest
Amortization of Postretirement Benefit |  |  |  |  |  |
Prior service cost |  | $ | (241 | ) |  | $ | (241 | ) |  | Other income (2)
Actuarial (losses) |  | (61 | ) |  | (97 | ) |  | Other income (2)
|  | (302 | ) |  | (338 | ) |  | Total before tax
|  | — |  |  | — |  |  | Provision for income taxes
|  | (302 | ) |  | (338 | ) |  | Net of tax and noncontrolling interest
Credit risk changes of fair value option liabilities |  |  |  |  |  |
|  | $ | (1,094 | ) |  | $ | — |  |  | Credit Risk Changes of Fair Value Option Liabilities
|  | 188 |  |  | — |  |  | Provision for income taxes
|  | $ | (906 | ) |  | $ | — |  |  | Net of tax and noncontrolling interest
Total reclassifications for the period |  | $ | (47,342 | ) |  | $ | (2,759 | ) |  | Net of tax and noncontrolling interest
Details about Accumulated Other Comprehensive Income Components |  | Amount Reclassified from Accumulated Other Comprehensive Income (1) |  | Affected Line Item in the Consolidated Statement of Total Comprehensive Income (Loss)
| Six Months Ended June 30, |
| 2018 |  | 2017 |
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |  |
|  | $ | (50,111 | ) |  | $ | 6,414 |  |  | Net realized investment (losses) gains and other-than-temporary impairment losses
|  | (586 | ) |  | — |  |  | Tax (expense) benefit
|  | $ | (50,697 | ) |  | $ | 6,414 |  |  | Net of tax and noncontrolling interest
Amortization of Postretirement Benefit |  |  |  |  |  |
Prior service cost |  | $ | (482 | ) |  | $ | (482 | ) |  | Other income (2)
Actuarial gains |  | (123 | ) |  | (194 | ) |  | Other income (2)
|  | (605 | ) |  | (676 | ) |  | Total before tax
|  | — |  |  | — |  |  | Tax (expense) benefit
|  | $ | (605 | ) |  | $ | (676 | ) |  | Net of tax and noncontrolling interest
Credit risk changes of fair value option liabilities |  |  |  |  |  |
|  | $ | 250 |  |  | $ | — |  |  | Credit Risk Changes of Fair Value Option Liabilities
|  | (42 | ) |  | — |  |  | Provision for income taxes
|  | $ | 208 |  |  | $ | — |  |  | Net of tax and noncontrolling interest
Total reclassifications for the period |  | $ | (51,094 | ) |  | $ | 5,738 |  |  | Net of tax and noncontrolling interest
(1) | Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income with corresponding increases to the affected line items in the Consolidated Statement of Total Comprehensive Income.
(2) | These accumulated other comprehensive income components are included in the computation of net periodic benefit cost.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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