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Income taxes (Reconciliation of statutory income tax expense to provision for income taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Statutory income tax rate 12.50% 12.50% 12.50%
Income tax (benefit) expense at statutory income tax rate of 12.5% $ (39,327) $ 167,580 $ 143,866
Permanent differences 22,486 (949) 1,016
Foreign rate differential (390) 1,083 (803)
Differences between statutory and actual income tax expense 22,096 134 213
Income tax (benefit) expense $ (17,231) $ 167,714 $ 144,079