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Investments - Credit loss rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Beginning balance $ 747 $ 800 $ 747 $ 800
Amounts related to credit loss for which an OTTI charge was not previously recognized 0 0 0 0
Increases to the amount related to credit loss for which OTTI was previously recognized 0 0 0 0
Realized losses for securities sold 0 0 0 0
Ending balance $ 747 $ 800 $ 747 $ 800