CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014
OPERATING ACTIVITIES
Net income (loss)		$ (1,683,701)		$ 530,373
Adjustments to reconcile net income (loss) to net cash provided by continuing operations activities:
Loss from discontinued operations		11,163		52,639
Depreciation, depletion and amortization		1,318,123		1,354,393
Impairment of assets		2,300,974
Amortization of deferred major repair costs		5,450		6,390
Dry hole costs		120,459		203,607
Amortization of undeveloped leases		62,331		55,745
Accretion of asset retirement obligations		35,437		36,992
Deferred and noncurrent income tax charges (benefits)		(975,120)		64,557
Pretax (gains) losses from disposition of assets		(154,183)		5,130
Net decrease in noncash operating working capital		97,026		6,940
Other operating activities, net		(41,431)		17,531
Net cash provided by continuing operations activities		1,096,528		2,334,297
INVESTING ACTIVITIES
Property additions and dry hole costs		(1,975,069)		(2,806,705)
Proceeds from sales of property, plant and equipment		423,842		3,138
Purchase of investment securities	[1]	(865,251)		(672,689)
Proceeds from maturity of investment securities	[1]	852,394		587,341
Other investing activities, net		(19,538)		(19,233)
Net cash required by investing activities		(1,583,622)		(2,908,148)
FINANCING ACTIVITIES
Borrowings of debt		885,000		1,050,000
Repayments of debt		(450,000)
Capital lease obligation payments		(7,156)
Purchase of treasury stock		(250,000)		(375,000)
Withholding tax on stock-based incentive awards		(8,976)		(6,786)
Cash dividends paid		(184,789)		(174,248)
Other financing activities, net		(153)		(1,384)
Net cash provided (required) by financing activities		(16,074)		492,582
CASH FLOWS FROM DISCONTINUED OPERATIONS
Operating activities		(4,866)		(83,974)
Investing activities		5,343		(12,101)
Changes in cash included in current assets held for sale		179,774		103,694
Net increase in cash and cash equivalents of discontinued operations		180,251		7,619
Effect of exchange rate changes on cash and cash equivalents		8,276		(2,484)
Net decrease in cash and cash equivalents		(314,641)		(76,134)
Cash and cash equivalents at January 1		1,193,308	[2]	750,155
Cash and cash equivalents at September 30		$ 878,667		$ 674,021

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

[2] Reclassified to conform to current presentation.