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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2020
Income Tax Disclosure [Abstract]  
Provision for Income Taxes and Effective Income Tax Rates
The provision (benefit) for income taxes and the effective income tax rates were as follows (dollars in thousands):
 
     Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
     2020     2019     2020     2019  
Provision (benefit) for income taxes
   $ 651   $ 266   $ (249   $ 805
Effective income tax rate
     10.1     4.3     (3.8 )%      5.9