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Other expenses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other Income and Expenses [Abstract]        
Deposit liabilities and reinsurance contracts investment expense $ 2,871 $ 1,146 $ 4,352 $ 2,365
Change in fair value of embedded derivatives in deposit and reinsurance contracts (1) 111 100 437 310
Other expenses $ 2,982 $ 1,246 $ 4,789 $ 2,675