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Long-Term Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) day $ / shares | Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  | $ 334,650,000 | $ 0 | $ 334,650,000 |  |
Closing stock price (in usd per share) | $ / shares |  | $ 13.66 |  | $ 13.66 |  |  |
Cost incurred in connection with Capped Calls |  |  |  | $ 0 | 35,673,000 |  |
Loss (gain) on debt extinguishment |  | $ 0 | 344,000 | $ 0 | (10,919,000) |  |
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 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 |  |  |  |  |  |
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% |
Cardinal States Gathering Company Credit Facility maturing in March 2028 | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 107,705,000 |  | $ 107,705,000 |  | $ 114,985,000 |
Line of credit facility maximum borrowing capacity |  |  | 125,000,000 |  | $ 125,000,000 |  |
Cardinal States Gathering Company Credit Facility maturing in March 2028 | Line of Credit | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 4.50% |  |
CSG Holdings II LLC Credit Facility maturing in March 2027 | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 39,726,000 |  | $ 39,726,000 |  | $ 45,559,000 |
Line of credit facility maximum borrowing capacity |  |  | $ 50,000,000 |  | $ 50,000,000 |  |
CSG Holdings II LLC Credit Facility maturing in March 2027 | 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% |  | 5.875% |  |
Purchase of outstanding debt |  |  | $ 409,625,000 |  | $ 480,959,000 |  |
Loss (gain) on debt extinguishment |  |  | $ 344,000 |  | $ (10,919,000) |  |
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 |  | $ 12.84 |  |  |
Amount of if-converted value in excess of principal amount |  | $ 95,439,000 |  | $ 95,439,000 |  |  |
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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