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Revolving Credit Facility (Details) - USD ($)
$ in Thousands
Oct. 24, 2019
Sep. 30, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Revolving credit facility   $ 129,000 $ 0
Revolving Credit Facility | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Revolving credit facility, maximum loan amount   2,500,000  
Revolving credit facility, current borrowing base   1,600,000  
Revolving credit facility, aggregate lender commitments   1,200,000 1,000,000
Revolving credit facility [1]   129,000 0
Letters of credit [2]   0 200
Available borrowing capacity   1,071,000 999,800
Revolving credit facility, unamortized deferred financing costs   $ 6,300 $ 6,400
Revolving Credit Facility | Revolving Credit Facility | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Revolving credit facility, aggregate lender commitments $ 1,200,000    
Revolving credit facility [1] 143,000    
Letters of credit [2] 0    
Available borrowing capacity $ 1,057,000    
[1]
(1) 
Unamortized deferred financing costs attributable to the credit facility are presented as a component of the other noncurrent assets line item on the accompanying balance sheets and totaled $6.3 million and $6.4 million as of September 30, 2019, and December 31, 2018, respectively. These costs are being amortized over the term of the credit facility on a straight-line basis.
[2]
(2) 
Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis. The letter of credit outstanding as of December 31, 2018, was released during the three months ended March 31, 2019.