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Investments (Details 5) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities |  |  |  |  |  |
Reclassification of net realized investment (gains) losses to net income | $ 10,021 | [1],[2] |  | $ 14,481 | [1],[2] |
Fixed Maturity Securities [Member] |  |  |  |  |  |
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities |  |  |  |  |  |
Beginning of period | 411,979 |  | 298,096 | 423,004 |  | 284,338
Change in unrealized investment gains and losses | (182,919) |  | 61,869 | (189,828) |  | 75,867
Reclassification of net realized investment (gains) losses to net income | (8,392) |  | (3,861) | (12,508) |  | (4,101)
End of period | 220,668 |  | 356,104 | 220,668 |  | 356,104
Equity securities [Member] |  |  |  |  |  |
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities |  |  |  |  |  |
Beginning of period | 3,604 |  | 2,238 | 720 |  | 2,408
Change in unrealized investment gains and losses | 1,291 |  | 882 | 4,519 |  | 727
Reclassification of net realized investment (gains) losses to net income | (1,629) |  | (2,577) | (1,973) |  | (2,592)
End of period | $ 3,266 |  | $ 543 | $ 3,266 |  | $ 543
[1] | All amounts are net of tax.
[2] | The pretax amounts reclassified from accumulated other comprehensive income, $15,417 and $22,279, are included in net realized investment gains and the related tax expenses, $5,396 and $7,798, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2013, respectively.

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period before the impact of deferred policy acquisition costs. + References No definition available. + Details
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- Definition The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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