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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 |  |  |  |  |  |  |

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