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Income taxes - Significant components of Income tax expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:          
U.S. federal current expense (benefit)     $ (231) $ 0 $ (112)
State current expense (benefit)     (130) (706) 2,252
Foreign current expense     5,726 13,473 15,098
Total current expense     5,365 12,767 17,238
Deferred:          
U.S. federal deferred benefit     (1,564) (1,564) (1,696)
State deferred benefit     0 0 (12)
Foreign deferred tax expense     (977) (1,927) 2,778
Total deferred benefit     (2,541) (3,491) 1,070
Total income tax expense $ (308) $ (2,070) $ 2,824 $ 9,276 $ 18,308