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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]  
Provisions for Income Taxes and Effective Income Tax Rates

The provisions 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,
 
     2015     2014     2015     2014  

Provision for income taxes

   $ 61      $ —        $ 200      $ 17   

Effective income tax rate

     7.3     0.0     4.5     0.2