Investments (Details 2) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net investment income
Total gross investment income	$ 28,230	$ 36,706	$ 59,762	$ 73,117
Investment expenses	(1,736)	(1,897)	(3,293)	(4,009)
Net investment income	26,494	34,809	56,469	69,108
Fixed maturities and short term investments [Member]
Net investment income
Total gross investment income	27,535	36,346	56,470	72,101
Cash and cash equivalents [Member]
Net investment income
Total gross investment income	687	311	3,268	897
Securities lending income [Member]
Net investment income
Total gross investment income	$ 8	$ 49	$ 24	$ 119

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.

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