Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Costs Incurred in Exploration, Property Acquisitions and Development (Details)

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SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Costs Incurred in Exploration, Property Acquisitions and Development (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property acquisitions:      
Proved $ 45,484 $ 13,261 $ 90,869
Unproved 0 204 13,000
Exploration costs 0 0 0
Development 800 2,104 949
Costs incurred $ 46,284 $ 15,569 $ 104,818