XML 45 R34.htm IDEA: XBRL DOCUMENT v3.20.2
Derivatives - Open Derivative Contracts (Details)
MMBTU in Thousands
 1 Months Ended 9 Months Ended
Jul. 31, 2020
MMBTU
$ / Unit
Sep. 30, 2020
MMBTU
$ / Unit
Natural Gas Price Swaps: October 2020    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU   1,240
Weighted Average Fixed Price (in dollars per unit) | $ / Unit   2.14
Natural Gas Price Swaps: November 2020 - December 2020    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU 2,135  
Weighted Average Fixed Price (in dollars per unit) | $ / Unit 2.54  
Natural Gas Price Swaps: January 2021 - December 2021    
Derivative [Line Items]    
Notional (MMBtu) | MMBTU 10,950  
Weighted Average Fixed Price (in dollars per unit) | $ / Unit 2.61