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Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accounts receivable, gross $ 203,384     $ 372,440        
Allowance for doubtful accounts (1,110)     (1,259)        
Total accounts receivable, net 202,274     371,181        
Cumulative-effect adjustment to retained earnings (accumulated deficit) (638,151) $ (589,911) $ (499,172) 3,837,081 $ 3,899,661 $ 3,866,458 $ 3,811,135 $ 3,918,880
Retained Earnings (Accumulated Deficit)                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Cumulative-effect adjustment to retained earnings (accumulated deficit) (3,905,467) $ (3,849,768) $ (3,756,825) 554,446 $ 630,852 $ 610,564 $ 567,807 $ 682,689
Cumulative effect adjustment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Cumulative-effect adjustment to retained earnings (accumulated deficit)       (410)        
Cumulative effect adjustment | Retained Earnings (Accumulated Deficit)                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Cumulative-effect adjustment to retained earnings (accumulated deficit)       (410)        
Cumulative effect adjustment | Retained Earnings (Accumulated Deficit) | ASU 2016-13                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Cumulative-effect adjustment to retained earnings (accumulated deficit)       (400)        
Trade accounts                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accounts receivable, gross 156,780     276,629        
Joint interest accounts                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accounts receivable, gross 34,109     82,112        
Other accounts                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accounts receivable, gross $ 12,495     $ 13,699