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Income taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current income tax expense:      
Foreign $ 946 $ 1,912 $ 2,129
Federal (24) 0 48
State and local 13 11 12
Current income tax expense (benefit) 935 1,923 2,189
Deferred income tax expense (benefit):      
Foreign (493) (69) 0
Federal 4,530 (738) (352)
State and local 479 34 (476)
Deferred income tax expense (benefit) 4,617 (762) (767)
Provision for income taxes $ 5,451 $ 1,150 $ 1,361