CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 674,021		$ 750,155
Canadian government securities with maturities greater than 90 days at the date of acquisition	460,190		374,842
Accounts receivable, less allowance for doubtful accounts of $1,609 in 2014 and 2013	970,286		999,872
Inventories, at lower of cost or market
Crude oil	40,311		40,077
Materials and supplies	259,644		254,118
Prepaid expenses	86,091		83,856
Deferred income taxes	60,700		61,991
Assets held for sale	735,875		943,732
Total current assets	3,287,118		3,508,643
Property, plant and equipment, at cost less accumulated depreciation, depletion and amortization of $9,698,266 in 2014 and $8,540,239 in 2013	14,372,837		13,481,055
Goodwill	38,198		40,259
Deferred charges and other assets	87,106		98,123
Assets held for sale	60,507		381,404
Total assets	17,845,766		17,509,484
Current liabilities
Current maturities of long-term debt	39,607		26,249
Accounts payable and accrued liabilities	2,249,579		2,335,712
Income taxes payable	145,185		222,930
Liabilities associated with assets held for sale	185,846		639,140
Total current liabilities	2,620,217		3,224,031
Long-term debt, including capital lease obligation	3,986,261		2,936,563
Deferred income taxes	1,519,677		1,466,100
Asset retirement obligations	897,765		852,488
Deferred credits and other liabilities	344,301		339,028
Liabilities associated with assets held for sale	75,037		95,544
Stockholders' equity
Cumulative Preferred Stock, par $100, authorized 400,000 shares, none issued
Common Stock, par $1.00, authorized 450,000,000 shares, issued 195,036,689 shares in 2014 and 194,920,155 shares in 2013	195,037		194,920
Capital in excess of par value	896,567		902,633
Retained earnings	8,414,917		8,058,792
Accumulated other comprehensive income (loss)	(17,809)	[1]	172,119	[1]
Treasury stock, 17,541,917 shares of Common Stock in 2014 and 11,513,642 shares of Common Stock in 2013, at cost	(1,086,204)		(732,734)
Total stockholders' equity	8,402,508		8,595,730
Total liabilities and stockholders' equity	$ 17,845,766		$ 17,509,484

[1] All amounts are presented net of income taxes.