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Taxation - Income tax uncertainties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]      
January 1 $ 5,689 $ 8,743 $ 7,941
Changes in tax positions taken during a prior period - decrease   (4,229)  
Changes in tax positions taken during a prior period - increase 3,870   764
Tax positions taken during the current period - increase 0 1,379 346
Change as a result of a lapse in the statute of limitations 0 0 0
Impact of the change in foreign currency exchange rates 714    
Impact of the change in foreign currency exchange rates   (204) (308)
December 31 10,273 5,689 8,743
Unrecognized tax benefits impacting effective tax rate 0 0 0
Unrecognized tax benefits that, if recognized, would impact the effective tax rate      
Income Tax Contingency [Line Items]      
January 1 4,185 6,639 6,460
Changes in tax positions taken during a prior period - decrease   (3,560)  
Changes in tax positions taken during a prior period - increase 1,415   73
Tax positions taken during the current period - increase 0 1,258 346
Change as a result of a lapse in the statute of limitations 0 0 0
Impact of the change in foreign currency exchange rates 480    
Impact of the change in foreign currency exchange rates   (152) (240)
December 31 6,080 4,185 6,639
Interest and penalties recognized on the above      
Income Tax Contingency [Line Items]      
January 1 1,504 2,104 1,481
Changes in tax positions taken during a prior period - decrease   (669)  
Changes in tax positions taken during a prior period - increase 2,455   691
Tax positions taken during the current period - increase 0 121 0
Change as a result of a lapse in the statute of limitations 0 0 0
Impact of the change in foreign currency exchange rates 234    
Impact of the change in foreign currency exchange rates   (52) (68)
December 31 $ 4,193 $ 1,504 $ 2,104