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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Summary of Accumulated Other Comprehensive Loss
     Six months ended
June 30,		  
     2018      2017  
     (in thousands)  

Beginning balance

    $ (2,289 )     $ (4,583 ) 

Other comprehensive income (loss) before reclassifications

      (918 )       1,639  

Amounts reclassified from accumulated other comprehensive loss

      —          —    
  

 

 

     

 

 

  

Ending Balance

    $ (3,207 )     $ (2,944 )