Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Short-term investments, available-for-sale, at fair value, amortized cost	$ 13,022	$ 32,477
Fixed maturity investments, available-for-sale, at fair value, amortized cost	$ 225,595	$ 210,825
Common shares, par value	$ 1	$ 1
Common shares, authorized	156,000,000	156,000,000
Ordinary shares, shares issued	1,501,211
Share Capital - Ordinary Shares [Member]
Ordinary shares, shares issued	13,846,728	13,802,706
Ordinary shares, shares outstanding	13,846,728	13,802,706
Series A Non-Voting Convertible Ordinary Shares [Member]
Ordinary shares, shares issued	2,972,892	2,972,892
Treasury shares at cost (Series A non-voting convertible ordinary shares)	2,972,892	2,972,892
Series C Non-Voting Convertible Ordinary Shares [Member]
Ordinary shares, shares issued	2,725,637	2,725,637
Ordinary shares, shares outstanding	2,725,637	2,725,637