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v3.20.4

Long-Term Debt - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) day $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Apr. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,000 |  |  |  |  |  |  |
Gain on debt extinguishment |  |  | $ 10,101,000 | $ (7,614,000) | $ (54,118,000) |  |  |  |
Proceeds from issuance of Convertible Notes |  |  | 334,650,000 | 0 | 0 |  |  |  |
Cost incurred with Capped Calls |  |  | 35,673,000 | 0 | $ 0 |  |  |  |
Income tax benefit capped call |  | 9,322,000 |  |  |  |  |  |  |
Net impact of Capped Calls |  |  | 26,351,000 |  |  |  |  |  |
Senior Notes due in January 2029 | Debt Instrument, Issuance, Period Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 500,000,000 |  |  |
Stated rate, debt instrument |  |  |  |  |  | 6.00% |  |  |
Senior Notes due March 2027 at 7.25% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 700,000,000 | $ 500,000,000 |  |  |  |  |
Stated rate, debt instrument |  |  | 0.0725% | 0.0725% |  |  |  |  |
5.875% Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 894,307,000 |  |  |  |  |
Stated rate, debt instrument |  |  | 5.875% | 0.00059% | 5.875% |  |  |  |
Purchase of outstanding debt |  |  | $ 894,307,000 | $ 400,000,000 | $ 411,375,000 |  |  |  |
Gain on debt extinguishment |  |  | 10,101,000 | (7,614,000) | (15,320,000) |  |  |  |
Senior Notes due March 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 400,000,000 | $ 400,000,000 |  |  |  |  |
Stated rate, debt instrument |  |  | 0.065% | 0.065% |  |  |  |  |
Senior Notes due April 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 500,000,000 |  |  |  |
Stated rate, debt instrument |  |  |  |  | 8.00% |  |  |  |
Gain on debt extinguishment |  |  |  |  | $ 38,798,000 |  |  |  |
Convertible 2.25% Senior Notes Due 2026 | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 345,000,000 |  |  |  |  |  |  |
Stated rate, debt instrument |  | 2.25% |  |  |  |  |  |  |
Conversion rate |  | 77.8816 |  |  |  |  |  |  |
Initial conversion price (in usd per share) | $ / shares |  | $ 12.84 | $ 12.84 |  |  |  |  |  |
Debt issuance costs gross |  | $ 10,350,000 |  |  |  |  |  |  |
Convertible 2.25% Senior Notes Due 2026 | Convertible Debt | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  | 130.00% |  |  |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 30 |  |  |  |  |  |  |
Convertible 2.25% Senior Notes Due 2026 | Convertible Debt | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, 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 |  |  |  |  |  |  |
Private Placement | Senior Notes due March 2027 at 7.25% | Debt Instrument, Issuance, Period Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 200,000,000 |  |  |  |  |  |  |  |
Stated rate, debt instrument | 7.25% |  | 7.25% | 7.25% |  |  |  |  |
Unamortized premium | $ 7,000,000 |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed | 103.50% |  |  |  |  |  |  |  |
Effective yield (as a percent) | 6.34% |  |  |  |  |  |  |  |
Capped Call Transaction |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Cost incurred with Capped Calls |  | 35,673,000 |  |  |  |  |  |  |
Net impact of Capped Calls |  | $ 26,351,000 |  |  |  |  |  |  |
Minimum | Capped Call Transaction | Call Option |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Price per share (in usd per share) | $ / shares |  | $ 12.84 |  |  |  |  |  |  |
Maximum | Capped Call Transaction | Call Option |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Price per share (in usd per share) | $ / shares |  | $ 18.19 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 160,000,000 |
Maximum borrowing capacity |  | $ 1,900,000,000 |  |  |  | $ 1,775,000,000 |  |  | $ 2,100,000,000
Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 175,000,000 |  |
Credit Facility | CSG Holdings II LLC Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 45,559,000 |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 50,000,000 |  |  |  |  |  |
Credit Facility | CSG Holdings II LLC Credit Facility | 3-Month LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 6.75% |  |  |  |  |  |
Credit Facility | Cardinal States Gathering Company Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 114,985,000 |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 125,000,000 |  |  |  |  |  |
Credit Facility | Cardinal States Gathering Company Credit Facility | 3-Month LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 4.50% |  |  |  |  |  |

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