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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Available for sale, amortized cost $ 1,281,954 $ 1,243,144
Available for sale, at cost $ 133,911 $ 124,915
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 10,150,130 10,102,927
Ordinary shares, shares outstanding 10,075,346 10,073,376
Treasury shares, shares 74,784 29,551
Ordinary Shares B    
Ordinary shares, shares issued 4,133,366 4,133,366
Ordinary shares, shares outstanding 4,133,366 4,133,366