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Deposit contracts (Tables)
 6 Months Ended
Jun. 30, 2018
Deposit Contracts, Liabilities [Abstract]  
Schedule of deposit contracts
The following table represents activity for the deposit contracts for the six months ended June 30, 2018 and year ended December 31, 2017:
 
June 30,
2018
 
December 31,
2017
Balance, beginning of period
$
129,133

 
$
104,905

Consideration received
1,114

 
22,658

Consideration receivable
—

 
2,080

Net investment expense allocation
2,449

 
2,800

Payments
(2,893
)
 
(3,545
)
Foreign currency translation
(103
)
 
235

Balance, end of period
$
129,700

 
$
129,133