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Deposit contracts (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of deposit contracts    
Balance, beginning of period $ 120,946 $ 50,446
Consideration received 6,132 66,369
Net investment expense allocation and change in fair value of embedded derivatives 3,996 4,731
Payments (350) (600)
Balance, end of period 142,990 120,946
Minimum
    
Deposit Contracts [Line Items]    
Aggregate excess of loss agreement, crediting rate 2.50%  
Aggregate excess of loss agreement, variable crediting rate 6.10%  
Maximum
    
Deposit Contracts [Line Items]    
Aggregate excess of loss agreement, crediting rate 3.00%  
Aggregate excess of loss agreement, variable crediting rate 6.50%  
Reinsurance Balance Receivable [Member]
    
Schedule of deposit contracts    
Consideration received $ 12,266 $ 0