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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Principal components on income tax expense:      
Current taxes $ 4,728 $ 3,889 $ 1,989
Deferred taxes 354 632 9,405
Income tax expense $ 5,082 $ 4,521 $ 11,394