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Long-Term Debt - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
conversionCondition
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
day
conversionCondition
$ / shares
Jun. 30, 2019
USD ($)
Jul. 01, 2020
USD ($)
Jun. 01, 2020
USD ($)
Apr. 24, 2020
USD ($)
Apr. 23, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 15, 2019
USD ($)
Debt Instrument [Line Items]                    
Total long-term debt $ 2,761,673,000   $ 2,761,673,000           $ 2,711,573,000  
Gain on extinguishment of debt 0 $ 0 83,887,000 $ 0            
Unsecured Senior Notes                    
Debt Instrument [Line Items]                    
Long-term debt, fair value 301,200,000   301,200,000              
Senior Notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount of debt repurchased 133,900,000   133,900,000              
Cost of debt repurchased 52,900,000   52,900,000              
Gain on extinguishment of debt     80,200,000              
Write-off of deferred finance cost     $ 800,000              
Senior Notes | 2022 and 2023 Notes                    
Debt Instrument [Line Items]                    
Debt maturity - number of days before maturity of senior unsecured notes     90 days              
Total long-term debt 1,142,200,000   $ 1,142,200,000              
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023                    
Debt Instrument [Line Items]                    
Total long-term debt $ 244,800,000   $ 244,800,000              
Stated interest rate (as percent) 2.625%   2.625%              
Aggregate principal amount of debt repurchased $ 23,000,000.0   $ 23,000,000.0              
Cost of debt repurchased 15,200,000   15,200,000              
Gain on extinguishment of debt 3,700,000                  
Write-off of deferred finance cost 200,000                  
Debt issued 244,800,000   244,800,000              
Amortization of debt discount 4,200,000                  
Equity component of convertible debt $ 300,000   $ 300,000              
Debt conversion rate per $1000 principal (in shares per $1000)     0.076365              
Debt conversion price (in dollars per share) | $ / shares $ 13.10   $ 13.10              
Number of contingent conditions met | conversionCondition 0   0              
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023 | Debt Conversion Scenario 1                    
Debt Instrument [Line Items]                    
Number of trading days | day     20              
Number of consecutive trading days | day     30              
Stock price relative to conversion price (percent)     130.00%              
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023 | Debt Conversion Scenario 2                    
Debt Instrument [Line Items]                    
Number of trading days | day     5              
Number of consecutive trading days | day     5              
Stock price relative to product of sale price and conversion rate (percent)     98.00%              
Senior Notes | Notes                    
Debt Instrument [Line Items]                    
Unsecured debt $ 1,580,900,000   $ 1,580,900,000              
Senior Notes | Notes | Minimum                    
Debt Instrument [Line Items]                    
Stated interest rate (as percent) 6.25%   6.25%              
Senior Notes | Notes | Maximum                    
Debt Instrument [Line Items]                    
Stated interest rate (as percent) 6.875%   6.875%              
Senior Notes | 6.50% senior unsecured notes due November 1, 2021                    
Debt Instrument [Line Items]                    
Stated interest rate (as percent) 6.50%   6.50%              
Aggregate principal amount of debt repurchased $ 28,200,000   $ 28,200,000              
Senior Notes | 6.875% senior unsecured notes due March 15, 2022                    
Debt Instrument [Line Items]                    
Stated interest rate (as percent) 6.875%   6.875%              
Aggregate principal amount of debt repurchased $ 56,500,000   $ 56,500,000              
Senior Notes | 6.875% senior unsecured notes due January 15, 2023                    
Debt Instrument [Line Items]                    
Stated interest rate (as percent) 6.875%   6.875%              
Aggregate principal amount of debt repurchased $ 44,200,000   $ 44,200,000              
Senior Notes | 6.25% senior unsecured notes due May 1, 2026                    
Debt Instrument [Line Items]                    
Stated interest rate (as percent) 6.25%   6.25%              
Aggregate principal amount of debt repurchased $ 4,900,000   $ 4,900,000              
Revolving Credit Facility | Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit facility amount 3,000,000,000.0   $ 3,000,000,000.0              
Debt maturity - number of days before maturity of senior unsecured notes     90 days              
Credit facility borrowing base           $ 612,500,000 $ 625,000,000.0 $ 1,300,000,000.0    
Line of credit facility, current borrowing capacity             625,000,000.0 $ 1,100,000,000.0    
Line of credit facility, remaining borrowing capacity 38,900,000   $ 38,900,000              
Interest charges 1,000,000.0   30,300,000              
Revolving Credit Facility | Credit Facility | Oasis Credit Facility                    
Debt Instrument [Line Items]                    
Total long-term debt 502,000,000.0   502,000,000.0              
Line of credit facility, current borrowing capacity $ 612,500,000   $ 612,500,000              
Weighted average interest rate (as percent) 3.40%   3.40%              
Letters of credit outstanding $ 71,600,000   $ 71,600,000              
Cash on hand threshold for prepayments             $ 60,000,000      
Company's maximum ratio -Total Debt to EBITDA             4.00      
Revolving Credit Facility | Credit Facility | OMP Credit Facility                    
Debt Instrument [Line Items]                    
Total long-term debt 487,500,000   487,500,000              
Credit facility borrowing base $ 575,000,000.0   $ 575,000,000.0              
Weighted average interest rate (as percent) 1.90%   1.90%              
Line of credit facility, remaining borrowing capacity $ 87,500,000   $ 87,500,000              
Interest charges $ 2,100,000   $ 28,000,000.0              
Revolving Credit Facility | Credit Facility | OMP Credit Facility | Minimum                    
Debt Instrument [Line Items]                    
Commitment fee percentage     0.375%              
Revolving Credit Facility | Credit Facility | OMP Credit Facility | Maximum                    
Debt Instrument [Line Items]                    
Commitment fee percentage     0.50%              
Revolving Credit Facility | Credit Facility | Subsequent Event                    
Debt Instrument [Line Items]                    
Credit facility borrowing base         $ 600,000,000.0          
Revolving Credit Facility | Swingline Loan                    
Debt Instrument [Line Items]                    
Credit facility borrowing base             $ 100,000,000.0     $ 50,000,000.0