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Long-Term Debt - Additional Information (Details)						5 Months Ended	9 Months Ended
	Apr. 26, 2019	Apr. 25, 2019	Mar. 15, 2019 USD ($)	May 04, 2018	Nov. 30, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) redetermination	Oct. 29, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Document Period End Date							Sep. 30, 2019
Senior Notes
Debt Instrument [Line Items]
Debt discount						$ 3,643,000	$ 3,643,000		$ 0
Percentage of principal amount, eligible to be redeemed							35.00%
Redemption price percentage							100.00%
Percentage of principal amount, redeemable							65.00%
Percentage of principal amount, event of default							25.00%
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Borrowing base						1,200,000,000	$ 1,200,000,000	$ 1,200,000,000
Elected commitments						800,000,000.0	800,000,000.0
Line of credit, term				5 years
Borrowings, outstanding amount						120,000,000.0	120,000,000.0
Remaining borrowing capacity, net of current borrowings outstanding						679,200,000	679,200,000
Maximum borrowing base						1,500,000,000	$ 1,500,000,000
Number of optional borrowing base redeterminations | redetermination							2
Letter of Credit | Line of Credit
Debt Instrument [Line Items]
Letters of credit outstanding						$ 800,000	$ 800,000
Minimum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage						0.375%
Debt instrument, covenant, minimum current ratio							1.0
Maximum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage						0.50%
Debt instrument, covenant, maximum leverage ratio	3.0						4.0
Senior Notes Due 2027 | Senior Notes
Debt Instrument [Line Items]
Long-term debt			$ 500,000,000.0
Interest rate, stated percentage			6.875%			6.875%	6.875%
Private placement price as percentage of par			99.235%
Proceeds from borrowings, net of issuance costs			$ 489,000,000.0
Debt discount			3,800,000
Debt issuance costs			$ 7,200,000
Redemption price percentage			106.875%
Percentage of principal amount, change in control			101.00%
Senior Notes Due 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt					$ 400,000,000.0
Interest rate, stated percentage					5.375%	5.375%	5.375%
Proceeds from borrowings, net of issuance costs					$ 391,000,000.0
Debt issuance costs					$ 9,000,000.0
Redemption price percentage					105.375%
Percentage of principal amount, change in control					101.00%
Adjusted For Statutory Reserve Requirements - London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%				1.25%
Adjusted For Statutory Reserve Requirements - London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%				2.25%
Federal Funds Effective Swap Rate | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate						0.50%
One-Month London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate						1.00%
London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%				0.25%
London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%				1.25%

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