Unaudited Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fixed maturities available for sale, at amortized cost	$ 9,722,364	$ 9,564,634
Short-term investments available for sale, at amortized cost	1,485,378	1,477,584
Investment of funds received under securities lending agreements, at cost	93,274	97,943
Equity securities, at cost	475,868	433,275
Other investments, at cost	417,762	488,687
Investment in joint venture, at cost	$ 100,000	$ 100,000
Common shares, par value per share	$ 0.0033	$ 0.0033
Common shares issued (shares)	170,006,958	169,560,591
Common shares held in treasury (shares)	35,922,820	35,885,707