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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available for sale, amortized cost $ 1,541,284 $ 1,272,948
Available for sale, at cost 103,019 99,297
Available for sale, at cost $ 28,887 $ 33,174
Ordinary shares, par value $ 0.0001 $ 0.0001
Ordinary shares, shares authorized 900,000,000 900,000,000
Ordinary Shares A    
Ordinary shares, shares issued 16,741,806 16,331,577
Ordinary shares, shares outstanding 13,665,096 13,266,762
Treasury shares, cost 3,076,710 3,064,815
Ordinary Shares B    
Ordinary shares, shares issued 12,061,370 12,061,370
Ordinary shares, shares outstanding 12,061,370 12,061,370