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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of financial assets and liabilities at fair value
(in thousands)  Fair Value Measurements Using 
   Level 1   Level 2   Level 3   Total 
March 31, 2019                
Assets:                
Commodity derivatives  $     -   $147   $     -   $147 
Liabilities:                    
Commodity derivatives  $-   $1,975   $-   $1,975 
                     
December 31, 2018                    
Asset:                    
Commodity derivatives  $-   $7,022   $-   $7,022