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Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 397,721 $ 389,128
Allowance for doubtful accounts (1,617) (1,526)
Total accounts receivable, net 396,104 387,602
Trade accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 262,189 245,546
Joint interest accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 124,395 133,375
Other accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 11,137 $ 10,207