Long-Term Debt - Additional Information (Details)
3 Months Ended
Apr. 26, 2019
USD ($)
Mar. 15, 2019
USD ($)
May 04, 2018
Nov. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
redetermination
Dec. 31, 2018
USD ($)
Nov. 02, 2018
USD ($)
Senior Notes              
Debt Instrument [Line Items]              
Debt discount         $ 3,825,000 $ 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         $ 1,000,000,000   $ 1,000,000,000
Elected commitments         800,000,000    
Line of credit, term     5 years        
Borrowings, outstanding amount         0    
Remaining borrowing capacity, net of current borrowings outstanding         799,200,000    
Maximum borrowing base         $ 1,500,000,000    
Number of optional borrowing base redeterminations | redetermination         2    
Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Borrowing base $ 1,200,000,000            
Letter of Credit | Line of Credit              
Debt Instrument [Line Items]              
Letters of credit outstanding         $ 800,000    
Minimum | Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Commitment fee percentage on unused amounts         0.375%    
Debt instrument, covenant, minimum current ratio         1    
Maximum | Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Commitment fee percentage on unused amounts         0.50%    
Debt instrument, covenant, maximum leverage ratio         4    
Maximum | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Debt instrument, covenant, maximum leverage ratio 3            
Senior Notes Due 2027 | Senior Notes              
Debt Instrument [Line Items]              
Long-term debt   $ 500,000,000          
Interest rate, stated percentage   6.875%     6.875%    
Private placement price as percentage of par   99.235%          
Proceeds from borrowings, net of issuance costs   $ 489,000,000          
Debt discount   3,800,000          
Debt issuance costs   $ 7,200,000          
Redemption price percentage   106.875%          
Senior Notes Due 2026 | Senior Notes              
Debt Instrument [Line Items]              
Long-term debt       $ 400,000,000      
Interest rate, stated percentage       5.375% 5.375%    
Proceeds from borrowings, net of issuance costs       $ 391,000,000      
Debt issuance costs       $ 9,000,000      
Redemption price percentage       105.375%      
Percentage of principal amount, change in control       101.00%      
Adjusted For Statutory Reserve Requirements - London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Decrease to basis spread on variable rate after redetermination 0.25%            
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%    
Adjusted For Statutory Reserve Requirements - London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Basis spread on variable rate 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%    
Adjusted For Statutory Reserve Requirements - London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Basis spread on variable rate 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) | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Decrease to basis spread on variable rate after redetermination 0.25%            
London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Basis spread on variable rate         0.50%    
London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Basis spread on variable rate 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%    
London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.25%