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Defined Benefit Pension Plan (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost

The components of net periodic benefit cost included in the accompanying condensed consolidated statements of operations were as follows (in thousands):

 

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

Service cost

    $ 26      $ 24      $ 54      $ 46  

Interest cost

      26        27        53        52  

Amortization

      23        22        47        44  
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic benefit cost

    $ 75      $ 73      $ 154      $ 142