DEBT - Narrative (Details)		3 Months Ended	6 Months Ended
	Oct. 16, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) redetermindation	Dec. 31, 2019 USD ($)	Jul. 20, 2018 USD ($)
Revolving credit facility
Line of Credit Facility [Line Items]
Debt outstanding		$ 153,500,000	$ 153,500,000	$ 96,500,000
Credit facility maximum borrowing capacity					$ 2,000,000,000.0
Credit facility borrowing base		580,000,000.0	$ 580,000,000.0		$ 775,000,000.0
Number of interim redeterminations that may be requested | redetermindation			3
Period of redeterminations of borrowing base			12 months
Credit facility remaining borrowing capacity		$ 426,500,000	$ 426,500,000
Weighted average interest rate		2.41%	2.82%
5.375 % Senior Notes due 2027
Line of Credit Facility [Line Items]
Debt outstanding		$ 485,938,000	$ 485,938,000	$ 500,000,000
5.375 % Senior Notes due 2027 | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 500,000,000.0
Debt instrument, interest rate, stated percentage	5.375%
Proceeds from issuance of senior long-term debt	$ 490,000,000.0
Debt repurchased		14,100,000	14,100,000
Debt outstanding		$ 485,900,000	$ 485,900,000
5.375 % Senior Notes due 2027 | Senior Notes | Minimum
Line of Credit Facility [Line Items]
Discount rate		97.50%	97.50%
5.375 % Senior Notes due 2027 | Senior Notes | Maximum
Line of Credit Facility [Line Items]
Discount rate		98.50%	98.50%