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Investments (Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Fixed Maturity Securities [Member]	Jun. 30, 2012 Fixed Maturity Securities [Member]	Jun. 30, 2013 Fixed Maturity Securities [Member]	Jun. 30, 2012 Fixed Maturity Securities [Member]	Jun. 30, 2013 Equity Securities [Member]	Jun. 30, 2012 Equity Securities [Member]	Jun. 30, 2013 Equity Securities [Member]	Jun. 30, 2012 Equity Securities [Member]	Jun. 30, 2013 Short-term Investments [Member]	Jun. 30, 2012 Short-term Investments [Member]	Jun. 30, 2013 Short-term Investments [Member]	Jun. 30, 2012 Short-term Investments [Member]	Jun. 30, 2013 Other Investments [Member]	Jun. 30, 2012 Other Investments [Member]	Jun. 30, 2013 Other Investments [Member]	Jun. 30, 2012 Other Investments [Member]	Jun. 30, 2013 Miscellaneous Investment Income [Member]	Jun. 30, 2012 Miscellaneous Investment Income [Member]	Jun. 30, 2013 Miscellaneous Investment Income [Member]	Jun. 30, 2012 Miscellaneous Investment Income [Member]	Jun. 30, 2013 Investment Expenses [Member]	Jun. 30, 2012 Investment Expenses [Member]	Jun. 30, 2013 Investment Expenses [Member]	Jun. 30, 2012 Investment Expenses [Member]	Mar. 31, 2013 Partnership Interest [Member]	Mar. 31, 2012 Partnership Interest [Member]	Mar. 31, 2013 Partnership Interest [Member]	Mar. 31, 2012 Partnership Interest [Member]
Net investment income earned	$ 34,003	$ 34,006	$ 66,873	$ 66,634	$ 30,298	$ 31,759	$ 60,387	$ 63,109	$ 1,874	$ 1,280	$ 3,081	$ 2,517	$ 29	$ 29	$ 81	$ 67	$ 3,869	$ 2,963	$ 7,471	$ 4,963	$ 0	$ 25	$ 0	$ 64	$ (2,067)	$ (2,050)	$ (4,147)	$ (4,086)	$ 3,900	$ 3,000	$ 7,500	$ 5,000