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Derivative Instruments - Narrative (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Bcf
Jun. 30, 2019
Bcf
May 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Derivative Instruments, Gain (Loss)        
Asset derivative instruments, at fair value $ 1,053,502,000     $ 812,664,000
Liability derivative instrument, at fair value $ 526,601,000     312,696,000
Maximum additional collateral as percentage of derivative liability 100.00%      
Aggregate fair value of derivative instruments with credit-risk related contingencies $ 44,700,000      
Collateral posted 0      
Subsequent Event        
Derivative Instruments, Gain (Loss)        
Collateral posted     $ 19,000,000  
Natural Gas Liquid Instrument        
Derivative Instruments, Gain (Loss)        
Asset derivative instruments, at fair value (1,100,000)     12,600,000
Liability derivative instrument, at fair value 20,000,000.0      
Commodity derivatives        
Derivative Instruments, Gain (Loss)        
Asset derivative instruments, at fair value 1,053,502,000     812,664,000
Liability derivative instrument, at fair value $ 526,601,000     $ 312,696,000
Cash flow hedging | Commodity derivatives        
Derivative Instruments, Gain (Loss)        
Volume of derivative instruments (in Bcf, Mbbls) | Bcf 1,846 1,644