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Investments (Details 10) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Investment Gains And Losses [Abstract] |  |  |  |
Other-than-temporary impairments on fixed maturity securities | $ (9,803) | $ (1,959) | $ (10,005) | $ (9,566)
Portion of loss recognized in accumulated other comprehensive income (before taxes) | (306) | 162 | (306) | (7,059)
Net other-than-temporary impairment losses on fixed maturities recognized in earnings | (10,109) | (1,797) | (10,311) | (16,625)
Impairment losses on equity securities | 0 | (2,186) | 0 | (3,025)
Gain on investment activity | 26,845 | 26,593 | 48,525 | 48,905
Loss on investment activity | (6,760) | (8,918) | (17,972) | (16,422)
Other impairment losses and change in mortgage loan provision | 125 | 1,762 | (1,501) | (4,081)
Derivatives and other, net | 38,142 | 8,347 | 123,873 | 58,569
Total investment related gains (losses), net | $ 48,243 | $ 23,801 | $ 142,614 | $ 67,321

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading 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 (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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