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Note 7 - Income Taxes - Reconciliation of Differences Between Income Tax Provision Computed and Statutory Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statutory tax rate 25.00% 19.00% 19.00%
Income tax expense at statutory rate $ (33,093) $ (61,566) $ (14,352)
Permanent differences 14,123 122,815 10,322
Effect of overseas tax rates 10,583 (1,754) (4,961)
Net tax charge related to attributes with full valuation allowance 28,607 (71,259) 12,769
Exempt dividends from joint ventures (1,014) 14 0
Return to provision adjustments (5,001) 6,150 (6,446)
Withholding taxes 1,995 984 876
Foreign exchange movements on tax balances 67 1,216 655
Income tax expense (benefit) $ 16,267 $ (3,400) $ (1,137)
Effective tax rate (12.30%) 1.00% 1.50%