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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
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) |  | Total
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 | (88,108 | ) |  | 1,273 |  |  | 73,586 |  |  | (13,249 | )
Balance at December 31, 2017 | $ | 30,755 |  |  | $ | 10,640 |  |  | $ | (93,634 | ) |  | $ | (52,239 | )
Year ended December 31, 2016: |  |  |  |  |  |  |
Beginning Balance | $ | 50,963 |  |  | $ | 9,344 |  |  | $ | (45,092 | ) |  | $ | 15,215 |
Other comprehensive income before reclassifications | 85,378 |  |  | 1,041 |  |  | (122,128 | ) |  | (35,709 | )
Amounts reclassified from accumulated other comprehensive income | (17,478 | ) |  | (1,018 | ) |  | — |  |  | (18,496 | )
Net current period other comprehensive income (loss) | 67,900 |  |  | 23 |  |  | (122,128 | ) |  | (54,205 | )
Balance at December 31, 2016 | $ | 118,863 |  |  | $ | 9,367 |  |  | $ | (167,220 | ) |  | $ | (38,990 | )
(1) | All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate debits.
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, |
2017 |  | 2016 |
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |
| $ | 14,805 |  |  | $ | (17,478 | ) |  | Net realized investment gains
| — |  |  | — |  |  | Tax (expense) benefit
| $ | 14,805 |  |  | $ | (17,478 | ) |  | Net of tax and noncontrolling interest (3)
Amortization of Postretirement Benefit |  |  |  |  |
Prior service cost | $ | (963 | ) |  | $ | (666 | ) |  | Underwriting and operating expenses (2)
Actuarial gains (losses) | (389 | ) |  | (352 | ) |  | Underwriting and operating expenses (2)
| (1,352 | ) |  | (1,018 | ) |  | Total before tax
| — |  |  | — |  |  | Tax (expense) benefit
| (1,352 | ) |  | (1,018 | ) |  | Net of tax and noncontrolling interest (3)
Total reclassifications for the period | $ | 13,453 |  |  | $ | (18,496 | ) |  | 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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- 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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