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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Long-Term Debt  
Schedule of interest incurred and paid on the credit facility, interest capitalized related to facilities and equipment under construction, and the related weighted average interest rates on long term debt

 

Years Ended December 31,

 2018  2017  2016 
(in thousands)         
Interest incurred $390  $415  $449 
Interest paid $241  $181  $284