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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Provision For Income Taxes And Effective Income Tax Rate Table Text Block [Table Text Block]
The provision (benefit) for income taxes and the effective income tax rates were as follows (dollars in thousands):
 
     Three Months Ended
June 30,		     Six Months Ended
June 30,		  
     2021     2020     2021     2020  
         
Provision (benefit) for income taxes
    $ 999     $ (406 )    $ 856     $ (900 ) 
Effective income tax rate
      4.9 %      (17.9 )%      2.4 %      (2,195.1 )%