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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers $ 590,550 $ 396,329 [1]
Gain (loss) on crude contracts [1]   (29,502)
Other operating income 442 8,302
Gain on sale of assets 12 (339) [1]
Total revenues 591,004 374,790 [1]
Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 523,655 329,786
Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 13,775 17,242
Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 53,120 49,301
United States Onshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 133,590 182,650
United States Onshore [Member] | Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 6,141 12,134
United States Onshore [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 5,864 6,770
United States Offshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 316,023 71,528
United States Offshore [Member] | Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 4,176 1,639
United States Offshore [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 2,506 2,937
Canada Onshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 27,344 21,293
Canada Onshore [Member] | Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 3,458 3,469
Canada Onshore [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 44,750 39,594
Canada Offshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 43,846 $ 54,315
Other Locations [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers $ 2,852  
[1] Reclassified to conform to current presentation (see Note A).