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v3.20.2

Long-Term Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) day $ / shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (108,000) | $ 0 | $ 10,812,000 | $ (7,614,000) |  |
Proceeds from issuance of convertible senior notes |  |  |  | 334,650,000 | 0 |  |
Cost incurred for capped calls, gross |  |  |  | 35,673,000 | 0 |  |
Income tax benefit capped call | $ 9,322,000 |  |  |  |  |  |
Purchase of capped call |  |  |  | $ 26,351,000 |  |  |
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 |  |  |  |  |  |
Purchase of capped call | $ 26,351,000 |  |  |  |  |  |
Capped Call Transaction | Call Option | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Strike price (in dollars per share) | $ / shares | $ 12.84 |  |  |  |  |  |
Capped Call Transaction | Call Option | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Strike price (in dollars per share) | $ / shares | $ 18.19 |  |  |  |  |  |
Senior Notes Due March 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 700,000,000 |  | $ 700,000,000 |  |  | $ 500,000,000
Stated rate, debt instrument |  | 7.25% |  | 7.25% |  |  |
Senior Notes Due March 2027 | Debt Instrument, Issuance, Period Two |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated rate, debt instrument |  | 7.25% |  | 7.25% |  |  |
Senior Notes Due March 2027 | Debt Instrument, Issuance, Period One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 500,000,000 |  | $ 500,000,000 |  |
Stated rate, debt instrument |  |  | 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 |  |  |
Unamortized bond premium |  | 7,000,000 |  | 7,000,000 |  |  |
Senior Notes Due April 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 363,348,000 |  | $ 363,348,000 |  |  | $ 894,307,000
Stated rate, debt instrument |  | 5.875% | 5.875% | 5.875% | 5.875% |  |
Purchase of outstanding debt |  | $ 50,000,000 |  | $ 530,959,000 | $ 400,000,000 |  |
Gain (loss) on extinguishment of debt |  | (108,000) |  | 10,812,000 | $ (7,614,000) |  |
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% |  |  |
Convertible Senior Notes Due 2026 | Convertible Debt |  |  |  |  |  |  |
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 dollars per share) | $ / shares | $ 12.84 |  |  |  |  |  |
Debt issuance costs gross | $ 10,350,000 |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Debt Instrument, Redemption, Period One | Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |  |  |  |
Threshold trading days | day | 20 |  |  |  |  |  |
Threshold consecutive trading days | day | 30 |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Debt Instrument, Redemption, Period Two | Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |  |  |  |
Threshold trading days | day | 5 |  |  |  |  |  |
Threshold consecutive trading days | day | 10 |  |  |  |  |  |
Convertible 2.25% Senior Notes Due 2026, Additional Option To Initial Purchasers | Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 45,000,000 |  |  |  |  |  |
Convertible 2.25% Senior Notes Due 2026, Liability Component | Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs gross | 7,024,000 |  |  |  |  |  |
Convertible 2.25% Senior Notes Due 2026, Equity Component | Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs gross | $ 3,326,000 |  |  |  |  |  |
Cardinal States Gathering Company Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  | $ 125,000,000 |  | $ 125,000,000 |  |  |
Cardinal States Gathering Company Credit Facility | Line of Credit | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 4.75% |  |  |
CSG Holdings II LLC Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  | $ 50,000,000 |  | $ 50,000,000 |  |  |
CSG Holdings II LLC Credit Facility | Line of Credit | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 6.75% |  |  |

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