Related party transactions (Details) (Richmont Holdings, USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Related party transactions
Reimbursement fee payable per month	$ 160,000
Expense Reimbursement Fees		$ 1,870,000	$ 450,000
Minimum
Related party transactions
Term of agreement	1 year