XML 50 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1
Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 606,954 $ 509,035 [1]
Gain (loss) on crude contracts (29,502) 37,077 [1]
Other operating income (loss) 8,492 (1,454)
Gain (loss) on sale of assets (339) 131,982
Total revenues 585,605 676,640 [1]
Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 501,663 403,548
Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 23,434 17,177
Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 81,857 88,310
United States Onshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 182,649 149,986
United States Onshore [Member] | Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 12,134 9,647
United States Onshore [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 6,770 7,036
United States Offshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 71,528 53,813
United States Offshore [Member] | Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 1,639 1,916
United States Offshore [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 2,937 2,663
Canada Onshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 21,293 9,121
Canada Onshore [Member] | Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 3,469 432
Canada Onshore [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 39,594 39,847
Canada Offshore [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 54,315 37,014
Malaysia - Sarawak [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 77,306 65,783
Malaysia - Sarawak [Member] | Natural Gas Liquids [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 6,192 5,182
Malaysia - Sarawak [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 32,383 38,589
Malaysia - Block K [Member] | Crude Oil And Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 94,572 87,831
Malaysia - Block K [Member] | Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 173 $ 175
[1] Reclassified to conform to current presentation (see Notes A and B).