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Natural Gas and Oil Properties (Tables)
 3 Months Ended
Mar. 31, 2020
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Oil and Gas Exploration and Production Industries Disclosures Prices used to calculate the ceiling value of reserves were as follows:
(in millions)March 31, 2020March 31, 2019
Natural gas (per MMBtu)
$2.30  $3.07  
Oil (per Bbl)
$55.77  $63.00  
NGLs (per Bbl)
$9.96  $17.65