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Income taxes - Income Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Income (Loss) from Continuing Operations before Income Taxes, Domestic $ 13,562 $ 114,937 $ 57,251
Income (Loss) from Continuing Operations before Income Taxes, Foreign 39,023 66,038 34,078
Income before income taxes $ 52,585 $ 180,975 $ 91,329