Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosures About Natural Gas Producing Activities - Changes in Standardized Measure of Discounted Future Net Cash Flows Related to Proved Natural Gas & Condensate Reserves (Details)

v3.10.0.1
Supplemental Disclosures About Natural Gas Producing Activities - Changes in Standardized Measure of Discounted Future Net Cash Flows Related to Proved Natural Gas & Condensate Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]    
Beginning balance $ 88,202 $ 0
Sales and transfers of gas and condensate produced, net of production costs (1,773) (265)
Net changes in prices and production costs 27,530 0
Extensions, discoveries, additions and improved recovery, net of related costs 13,334 0
Development costs incurred 545 0
Revisions of estimated development costs 9,663 0
Revisions of previous quantity estimates 12,991 0
Accretion of discount 11,112 0
Net change in income taxes (9,472) (22,921)
Purchases of reserves in place 844 111,388
Sales of reserves in place 0 0
Changes in timing and other (7,165)  
Ending balance $ 145,811 $ 88,202