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Leasehold commitments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Leasehold Commitments [Line Items]  
2014 $ 2,236
2015 1,991
2016 1,676
2017 1,585
2018 1,621
Thereafter 15,798
Total minimum payments (1) $ 24,907 [1]
[1] Minimum payments have not been reduced by minimum sublease rentals of $2,644 thousand due in the future under non-cancelable subleases.