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Leasehold commitments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Leasehold Commitments [Line Items]  
2015 $ 2,305us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
2016 1,714us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
2017 1,585us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
2018 1,621us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
2019 1,669us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Thereafter 14,128us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
Total minimum payments (1) $ 23,022us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable [1]
[1] Minimum payments have not been reduced by minimum sublease rentals of $2,063 thousand due in the future under non-cancelable subleases.