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Income taxes - Significant components of Income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
U.S. federal current expense (benefit) $ 0 $ (112) $ 532
State current expense (benefit) (706) 2,252 (445)
Foreign current expense 13,473 15,098 6,198
Total current expense 12,767 17,238 6,285
Deferred:      
U.S. federal deferred benefit (1,564) (1,696) (3,905)
State deferred benefit 0 (12) (207)
Foreign deferred tax expense (1,927) 2,778 958
Total deferred benefit (3,491) 1,070 (3,154)
Total income tax expense $ 9,276 $ 18,308 $ 3,131