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Deposit contracts (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of deposit contracts    
Balance, beginning of period $ 120,946 $ 50,446
Consideration received 0 66,369
Net investment expense allocation and change in fair value of embedded derivatives 1,263 4,731
Payments (250) (600)
Balance, end of period $ 121,959 $ 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%