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Income taxes - Significant Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
U.S. federal current expense (benefit) $ (106) $ (231) $ 0
State current expense (benefit) 1,244 (130) (706)
Foreign current expense 12,305 5,726 13,473
Total current expense 13,443 5,365 12,767
Deferred:      
U.S. federal deferred benefit (2,522) (1,564) (1,564)
State deferred benefit (14) 0 0
Foreign deferred tax expense (3,324) (977) (1,927)
Total deferred benefit (5,860) (2,541) (3,491)
Total income tax expense $ 7,583 $ 2,824 $ 9,276