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Other Financial Information (Noncash Opearting Working Capital) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Financial Information [Abstract]      
Accounts receivable $ 119,671 $ 297,625 $ 175,820
Inventories (5,171) (15,340) 25,697
Prepaid expenses 149,946 (144,845) 6,575
Deferred income tax assets   3,924 6,884
Accounts payable and accrued liabilities (328,078) (36,887) (54,785)
Current income tax liabilities 24,943 (69,413) (163,920)
Net (increase) decrease in noncash operating working capital (38,689) 35,064 (3,729)
Cash income taxes paid, net of refunds 6,707 118,667 573,799
Interest paid, net of amounts capitalized 127,798 110,386 114,232
Asset retirement costs capitalized 13,690 76,775 70,568
Decrease in capital expenditure accrual $ 158,885 $ 462,474 $ 93,080