CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
OPERATING ACTIVITIES
Net income	$ 155,253		$ 360,599	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (income) from discontinued operations	14,033		(177,916)	[1]
Depreciation, depletion and amortization	396,249		363,142	[1]
Amortization of deferred major repair costs	2,741		1,990	[1]
Dry hole costs	87,909		41,011	[1]
Amortization of undeveloped leases	12,830		15,390	[1]
Accretion of asset retirement obligations	12,065		11,896	[1]
Deferred and noncurrent income tax charges	23,167		25,326	[1]
Pretax gain from disposition of assets	(19)		(42)	[1]
Net decrease in noncash operating working capital	18,673		100,949	[1]
Other operating activities, net	2,973		(13,896)	[1]
Net cash provided by continuing operations	725,874		728,449	[1]
Net cash provided by discontinued operations	10,005		192,678	[1]
Net cash provided by operating activities	735,879		921,127	[1]
INVESTING ACTIVITIES
Property additions and dry hole costs	(996,218)		(965,412)	[1]
Proceeds from sale of assets	26		0	[1]
Purchases of investment securities	(240,802)	[2]	(230,320)	[1],[2]
Proceeds from maturity of investment securities	243,641	[2]	130,385	[1],[2]
Investing activities of discontinued operations:
Sales proceeds	0		211,549	[1]
Other	(4,866)		(82,264)	[1]
Other - net	(3,736)		2,122	[1]
Net cash required by investing activities	(1,001,955)		(933,940)	[1]
FINANCING ACTIVITIES
Borrowings of long-term debt	479,000		261,989	[1]
Purchase of treasury stock	(250,000)		0	[1]
Proceeds from exercise of stock options	0		1,281	[1]
Withholding tax on stock-based incentive awards	(6,319)		(7,337)	[1]
Cash dividends paid	(56,073)		(59,672)	[1]
Other	(240)		(91)	[1]
Net cash provided by financing activities	166,368		196,170	[1]
Effect of exchange rate changes on cash and cash equivalents	(1,835)		(13,568)	[1]
Net increase (decrease) in cash and cash equivalents	(101,543)		169,789	[1]
Cash and cash equivalents, beginning	750,155		947,316	[1]
Cash and cash equivalents, ending	$ 648,612		$ 1,117,105	[1]

[1] Reclassified to conform to current presentation.

[2] Investments are Canadian government securities with maturities greater than 90 days at the date of acquisition.