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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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