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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Provision for Income Taxes and Effective Income Tax Rates

The provision for income taxes and the effective income tax rates for the three and six months ended June 30 were as follows (dollars in thousands):

 

     Three Months Ended
June 30,
    Six Months Ended
June 30,
 
     2018     2017     2018     2017  

Provision for income taxes

   $ 363   $ 267   $ 497   $ 168

Effective income tax rate

     4.4     150.0     4.0     13.6