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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2018
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 for the three months ended March 31 were as follows (dollars in thousands):

 

     2018     2017  

Provision (benefit) for income taxes

   $ 134   $ (99

Effective income tax rate

     3.3     (9.4 )%