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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of revenue The following table presents revenues from contracts with customers disaggregated by product:
Three Months Ended September 30,Nine Months Ended September 30,
(In thousands)2021202020212020
Natural gas $641,625 $333,256 $1,526,202 $991,882 
Other 53 38 182 181 
$641,678 $333,294 $1,526,384 $992,063