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Leasehold commitments (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leasehold Commitments [Line Items]      
Rent expense $ 3,019us-gaap_LeaseAndRentalExpense $ 2,925us-gaap_LeaseAndRentalExpense $ 2,468us-gaap_LeaseAndRentalExpense
Less: Sublease rentals (661)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 (559)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 (386)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Operating Leases, Rent Expense, Net $ 2,358us-gaap_OperatingLeasesRentExpenseNet $ 2,366us-gaap_OperatingLeasesRentExpenseNet $ 2,082us-gaap_OperatingLeasesRentExpenseNet