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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Provision for Income Taxes and Effective Income Tax Rates
The provision for income taxes and the effective income tax rates were as follows (dollars in thousands):
 
  Three Months Ended 
March 31,
 
  2019  2018 
Provision for income taxes
 $ 426  $ 134 
Effective income tax rate
  9.0%  3.3%