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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jan. 01, 2018
Total Operating Revenues and Other $ 4,781,624 $ 2,644,844 $ 12,700,863 $ 7,867,881    
Gathering and Processing Costs 114,063 32,590 324,577 105,480    
Marketing Costs 1,326,974 793,536 3,853,827 2,320,671    
Total Operating Expenses 3,274,937 2,430,008 9,354,657 7,417,391    
Operating Income (Loss) 1,506,687 214,836 3,346,206 450,490    
Accounts Receivable From Contracts With Customers 1,812,000   1,812,000     $ 1,343,000
Provisional Reduction in the Income Tax Provision     $ 52,000   $ 2,200,000  
Statutory Federal Income Tax Rate (in hundredths)     21.00%   35.00%  
Repatriation Tax of Foreign Earnings     $ 40,000   $ 179,000  
Crude Oil and Condensate            
Revenues 2,655,278 1,451,410 7,134,114 4,326,925    
Natural Gas Liquids            
Revenues 353,704 180,038 861,473 480,389    
Natural Gas            
Revenues 311,713 220,402 912,324 675,012    
Gathering, Processing and Marketing            
Revenues 1,360,992 $ 784,368 3,899,250 $ 2,289,702    
Amounts Without Adoption of ASU 2014-09            
Total Operating Revenues and Other 4,719,377   12,538,107      
Gathering and Processing Costs 56,899   177,849      
Marketing Costs 1,321,891   3,837,799      
Total Operating Expenses 3,212,690   9,191,901      
Operating Income (Loss) 1,506,687   3,346,206      
Amounts Without Adoption of ASU 2014-09 | Crude Oil and Condensate            
Revenues 2,655,278   7,134,114      
Amounts Without Adoption of ASU 2014-09 | Natural Gas Liquids            
Revenues 352,084   856,628      
Amounts Without Adoption of ASU 2014-09 | Natural Gas            
Revenues 256,169   770,441      
Amounts Without Adoption of ASU 2014-09 | Gathering, Processing and Marketing            
Revenues 1,355,909   3,883,222      
Effect of Change            
Total Operating Revenues and Other 62,247   162,756      
Gathering and Processing Costs 57,164   146,728      
Marketing Costs 5,083   16,028      
Total Operating Expenses 62,247   162,756      
Operating Income (Loss) 0   0      
Effect of Change | Crude Oil and Condensate            
Revenues 0   0      
Effect of Change | Natural Gas Liquids            
Revenues 1,620   4,845      
Effect of Change | Natural Gas            
Revenues 55,544   141,883      
Effect of Change | Gathering, Processing and Marketing            
Revenues $ 5,083   $ 16,028