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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Taxes [Line Items]        
Pre-tax earnings (loss) $ 7,392 $ (12,615) $ 5,588 $ (55,752)
Effective tax rate     21.80% (5.60%)
US federal income tax statutory rate     21.00%  
Income tax expense $ 1,120 $ 582 $ 1,219 $ 3,106
Canada [Member]        
Income Taxes [Line Items]        
Effective tax rate     23.00%