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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2013
Equity [Abstract] |
Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income | The following table displays the changes in the balances of each component of accumulated other comprehensive income for the three months ended March 31, 2013:
|  | Unrealized Gains (Losses) on Available- for-Sale Securities (1) |  |  | Loss on Foreign Currency Translation (1) |  |  | Amortization of Postretirement Benefit (1) |  |  | Total |
Balance at December 31, 2012 |  | $ | 651,272 |  |  | $ | (20,027 | ) |  | $ | (5,860 | ) |  | $ | 625,385 |
Other comprehensive income before reclassifications |  |  | 100,180 |  |  |  | (220 | ) |  |  | — |  |  |  | 99,960 |
Amounts reclassified from accumulated other comprehensive income |  |  | (6,082 | ) |  |  | — |  |  |  | 808 |  |  |  | (5,274 | )
Net current period other comprehensive income |  |  | 94,098 |  |  |  | (220 | ) |  |  | 808 |  |  |  | 94,686 |
Balance at March 31, 2013 |  | $ | 745,370 |  |  | $ | (20,247 | ) |  | $ | (5,052 | ) |  | $ | 720,071 |
(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 displays the significant amounts reclassed out of each component of accumulated other comprehensive income for the three months ended March 31, 2013:
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
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |  |
|  | $ | 6,082 |  |  | Net realized investment gains
|  |  | — |  |  | Tax (expense) benefit
|  | $ | 6,082 |  |  | Net of tax and noncontrolling interest (3)
Amortization of Postretirement Benefit |  |  |  |  |  |
Prior service cost |  | $ | (1,707 | ) |  | Underwriting and operating expenses (2)
Actuarial gains (losses) |  |  | 899 |  |  | Underwriting and operating expenses (2)
|  |  | (808 | ) |  | Total before tax
|  |  | — |  |  | Tax (expense) benefit
|  | $ | (808 | ) |  | Net of tax and noncontrolling interest (3)
Total reclassifications for the period |  | $ | 5,274 |  |  | Net of tax and noncontrolling interest (3)
(1) | Amounts in parentheses indicate debits to profit/loss.
(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 information on items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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=20435746&loc=SL7669686-108580 + Details
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