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Long-Term Debt - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 15, 2021
USD ($)
Apr. 30, 2020
USD ($)
day
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]                  
Debt instrument, face amount               $ 400,000,000  
Loss (gain) on debt extinguishment     $ 18,653,000 $ 108,000   $ 18,653,000 $ (10,812,000)    
Proceeds from issuance of convertible senior notes         $ 334,650,000 $ 0 334,650,000    
Closing stock price (in usd per share) | $ / shares     $ 12.62     $ 12.62      
Cost incurred in connection with Capped Calls           $ 0 35,673,000    
Line of Credit                  
Debt Instrument [Line Items]                  
Debt instrument, face amount                 $ 175,000,000
Capped Call Transaction                  
Debt Instrument [Line Items]                  
Cost incurred in connection with Capped Calls   $ 35,673,000              
Capped Call Transaction | Call Option | Minimum                  
Debt Instrument [Line Items]                  
Strike price (in usd per share) | $ / shares   $ 12.84              
Capped Call Transaction | Call Option | Maximum                  
Debt Instrument [Line Items]                  
Strike price (in usd per share) | $ / shares   $ 18.19              
Senior Notes Due April 2030                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 400,000,000     $ 400,000,000      
Stated rate, debt instrument     4.75%     4.75%      
Unamortized discount     $ 5,000,000     $ 5,000,000      
6.50% Senior Notes due March 2026                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 234,169,000     $ 234,169,000      
Stated rate, debt instrument     6.50%     6.50%   6.50%  
Purchase of outstanding debt     $ 165,831,000            
Loss (gain) on debt extinguishment     10,549,000     $ 10,549,000      
6.50% Senior Notes due March 2026 | Subsequent Event                  
Debt Instrument [Line Items]                  
Purchase of outstanding debt $ 246,853,000                
Redemption premium on long term debt 11,416,000                
Accrued interest on redeemed long term debt $ 1,268,000                
Cardinal States Gathering Company Credit Facility maturing in March 2028                  
Debt Instrument [Line Items]                  
Purchase of outstanding debt     107,705,000            
Loss (gain) on debt extinguishment     5,830,000     5,830,000      
Cardinal States Gathering Company Credit Facility maturing in March 2028 | Line of Credit                  
Debt Instrument [Line Items]                  
Debt instrument, face amount               $ 114,985,000  
Line of credit facility maximum borrowing capacity       125,000,000     125,000,000    
CSG Holdings II LLC Credit Facility maturing in March 2027                  
Debt Instrument [Line Items]                  
Purchase of outstanding debt     39,726,000            
Loss (gain) on debt extinguishment     2,274,000     2,274,000      
CSG Holdings II LLC Credit Facility maturing in March 2027 | Line of Credit                  
Debt Instrument [Line Items]                  
Debt instrument, face amount               45,559,000  
Line of credit facility maximum borrowing capacity       50,000,000     50,000,000    
Senior Notes Due March 2027                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 700,000,000     $ 700,000,000   $ 700,000,000  
Stated rate, debt instrument     7.25%     7.25%   7.25%  
Senior Notes Due March 2027 | Private Offering | Debt Instrument, Issuance, Period Two                  
Debt Instrument [Line Items]                  
Debt instrument, face amount       $ 200,000,000     $ 200,000,000    
Redemption price       103.50%          
Effective interest rate percentage       6.34%     6.34%    
Senior Notes Due April 2022                  
Debt Instrument [Line Items]                  
Stated rate, debt instrument       5.875%     5.875%    
Purchase of outstanding debt       $ 50,000,000     $ 530,959,000    
Loss (gain) on debt extinguishment       $ 108,000     $ (10,812,000)    
Convertible Senior Notes Due 2026                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 345,000,000     $ 345,000,000   $ 345,000,000  
Stated rate, debt instrument     2.25%     2.25%   2.25%  
Convertible Debt | Convertible Senior Notes Due 2026                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 345,000,000              
Stated rate, debt instrument   2.25%              
Unamortized discount     $ 89,938,000     $ 89,938,000   $ 101,367,000  
Conversion ratio (in shares)   77.8816              
Conversion price (in usd per share) | $ / shares     $ 12.84     $ 12.84      
Amount of if-converted value in excess of principal amount     $ 61,906,000     $ 61,906,000      
Threshold percentage of stock price trigger   130.00%              
Debt issuance costs gross   $ 10,350,000              
Convertible Debt | Convertible Senior Notes Due 2026 | Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Threshold trading days | day   20              
Threshold consecutive trading days | day   30              
Convertible Debt | Convertible Senior Notes Due 2026 | Debt Instrument, Redemption, Period Two                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price trigger   98.00%              
Threshold trading days | day   5              
Threshold consecutive trading days | day   10              
Convertible Debt | Convertible 2.25% Senior Notes Due 2026, Additional Option To Initial Purchasers                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 45,000              
Convertible Debt | Convertible 2.25% Senior Notes Due 2026, Liability Component                  
Debt Instrument [Line Items]                  
Debt issuance costs gross   7,024,000              
Convertible Debt | Convertible 2.25% Senior Notes Due 2026, Equity Component                  
Debt Instrument [Line Items]                  
Debt issuance costs gross   $ 3,326,000