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Long-Term Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2020
USD ($)
day
$ / shares
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Proceeds from issuance of Convertible Notes   $ 334,650,000    
Gain (loss) on extinguishment of debt   $ 0 $ 11,263,000  
Line of Credit        
Debt Instrument [Line Items]        
Debt instrument, face amount     175,000,000  
Minimum | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.75%    
Maximum | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate   2.75%    
Capped Call Transaction        
Debt Instrument [Line Items]        
Cost incurred for capped calls, gross $ 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      
Convertible Senior Notes Due 2026        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 345,000,000   $ 345,000,000
Stated rate, debt instrument   2.25%   2.25%
Cardinal States Gathering Company Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 111,389,000   $ 114,985,000
Line of credit facility maximum borrowing capacity     $ 125,000,000  
Cardinal States Gathering Company Credit Facility | Line of Credit | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate     4.50%  
CSG Holdings II LLC Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 43,331,000   $ 45,559,000
Line of credit facility maximum borrowing capacity     $ 50,000,000  
CSG Holdings II LLC Credit Facility | Line of Credit | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate     6.75%  
Senior Notes Due April 2022        
Debt Instrument [Line Items]        
Stated rate, debt instrument     5.875%  
Purchase of outstanding debt     $ 71,334,000  
Gain (loss) on extinguishment of debt     $ 11,263,000  
Convertible Debt | Convertible Senior Notes Due 2026        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 345,000,000      
Stated rate, debt instrument 2.25%      
Conversion ratio (in shares) 77.8816      
Conversion price (in usd per share) | $ / shares $ 12.84      
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, 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      
Convertible Debt | Convertible 2.25% Senior Notes Due 2026, Additional Option To Initial Purchasers        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 45,000