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Reinsurance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reinsurance Disclosures [Abstract]      
Assumed premiums written $ 17 $ 34 $ 38
Ceded premiums written $ 141 $ 215 $ 140