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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 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
Year Ended December 31, 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 before reclassifications | 135,903 |  |  | (556 | ) |  | (47,893 | ) |  | — |  |  | 87,454 |
Amounts reclassified from accumulated other comprehensive income | (80,755 | ) |  | (1,210 | ) |  | — |  |  | 935 |  |  | (81,030 | )
Net current period other comprehensive income | 55,148 |  |  | (1,766 | ) |  | (47,893 | ) |  | 935 |  |  | 6,424 |
Balance at December 31, 2018 | $ | 85,903 |  |  | $ | 8,874 |  |  | $ | (141,527 | ) |  | $ | (1,965 | ) |  | $ | (48,715 | )
Year ended December 31, 2017: |  |  |  |  |  |  |  |  |
Beginning Balance | $ | 118,863 |  |  | $ | 9,367 |  |  | $ | (167,220 | ) |  | $ | — |  |  | $ | (38,990 | )
Other comprehensive income before reclassifications | (96,325 | ) |  | 2,625 |  |  | 73,586 |  |  | — |  |  | (20,114 | )
Amounts reclassified from accumulated other comprehensive income | 14,805 |  |  | (1,352 | ) |  | — |  |  | — |  |  | 13,453 |
Adjustment to initially adopt ASU 2018-02 | (6,588 | ) |  | — |  |  | — |  |  | — |  |  | (6,588 | )
Net current period other comprehensive income (loss) | (88,108 | ) |  | 1,273 |  |  | 73,586 |  |  | — |  |  | (13,249 | )
Balance at December 31, 2017 | $ | 30,755 |  |  | $ | 10,640 |  |  | $ | (93,634 | ) |  | $ | — |  |  | $ | (52,239 | )
(1) | All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income.
(2) | Represents the ch anges in fair value attributable to instrument-specific credit risk of liabilities for which the fair value option is elected.
(3) | Beginning in 2018, credit risk changes of fair value option liabilities are reflected as a component of Accumulated Other Comprehensive Income pursuant to the adoption of ASU 2016-01. Refer to Note 2. Basis of Presentation and Significant Accounting Policies for further information regarding this change.
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 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
Year Ended December 31, |
2018 |  | 2017 |
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |
| $ | (81,665 | ) |  | $ | 14,805 |  |  | Net realized investment gains (loses)
| 910 |  |  | — |  |  | Provision for income taxes
| $ | (80,755 | ) |  | $ | 14,805 |  |  | Net of tax and noncontrolling interest (3)
Amortization of Postretirement Benefit |  |  |  |  |
Prior service cost | $ | (963 | ) |  | $ | (963 | ) |  | Other income (2)
Actuarial gains (losses) | (247 | ) |  | (389 | ) |  | Other income (2)
| (1,210 | ) |  | (1,352 | ) |  | Total before tax
| — |  |  | — |  |  | Provision for income taxes
| $ | (1,210 | ) |  | $ | (1,352 | ) |  | Net of tax and noncontrolling interest (3)
Credit Risk Changes of Fair Value Option Liabilities |  |  |  |  |
| $ | 1,096 |  |  | $ | — |  |  | Credit risk changes of fair value option liabilities
| (161 | ) |  | — |  |  | Provision for income taxes
| $ | 935 |  |  | $ | — |  |  | Net of tax and noncontrolling interest
Total reclassifications for the period | $ | (81,030 | ) |  | $ | 13,453 |  |  | Net of tax and noncontrolling interest (3)
(1) | Amounts in parentheses indicate debits to the Consolidated Statement of Comprehensive Income.
(2) | These accumulated other comprehensive income components are included in the computation of net periodic benefit cost.
(3) | Amount agrees with amount reported as reclassifications from AOCI in the disclosure about changes in AOCI balances.

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