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Income taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current income tax expense:      
Foreign $ 1,912 $ 2,129 $ 1,134
Federal 0 48 0
State and local 11 12 7
Current Income Tax Expense (Benefit) 1,923 2,189 1,141
Deferred income tax benefit:      
Foreign (69) 0 (234)
Federal (738) (352) (1,180)
State and local 34 (476) (195)
Deferred Income Tax Expense (Benefit) (762) (767) (1,617)
Provision for (benefit from) income taxes $ 1,150 $ 1,361 $ (468)