CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net loss		$ (25,000)	$ (212,048)
Adjustments to reconcile net loss to net cash provided by continuing operations activities:
(Income) loss from discontinued operations		(1,177)	885
Depreciation, depletion and amortization		714,782	797,288
Impairment of assets			95,088
Amortization of deferred major repair costs			3,794
Dry hole costs (credits)		(1,139)	15,226
Amortization of undeveloped leases		40,859	35,828
Accretion of asset retirement obligations		31,638	35,514
Deferred and noncurrent income tax benefit		(3,567)	(345,157)
Pretax gains from disposition of assets		(130,765)	(3,101)
Net (increase) decrease in noncash operating working capital		1,070	(152,618)	[1]
Other operating activities, net		192,867	9,651
Net cash provided by continuing operations activities		819,568	280,350
Investing Activities
Property additions and dry hole costs		(706,417)	(781,668)	[2]
Proceeds from sales of property, plant and equipment		69,146	1,154,623
Purchases of investment securities	[3]	(212,661)	(651,218)
Proceeds from maturity of investment securities	[3]	320,828	712,863
Other investing activities, net			(7,229)
Net cash (required) provided by investing activities		(529,104)	427,371
Financing Activities
Borrowings of debt		541,772	541,444
Repayments of debt		(550,000)	(600,000)
Capital lease obligation payments		(14,687)	(7,808)
Withholding tax on stock-based incentive awards		(7,151)	(1,138)
Issue cost of debt facility			(13,971)
Cash dividends paid		(129,421)	(163,586)
Other financing activities, net			(20)
Net cash required by financing activities		(159,487)	(245,079)
Cash Flows from Discontinued Operations
Operating activities		12,134	2,830
Changes in cash included in current assets held for sale		(12,904)	(2,830)
Net change in cash and cash equivalents of discontinued operations		(770)
Effect of exchange rate changes on cash and cash equivalents		(5,797)	7,268
Net increase in cash and cash equivalents		124,410	469,910
Cash and cash equivalents at beginning of period		872,797	283,183
Cash and cash equivalents at end of period		$ 997,207	$ 753,093

[1] 2016 balance includes payments for deepwater rig contract exit of $266.6 million.

[2] Includes costs of $206.7 million associated with acquisition of Kaybob Duvernay and Placid Montney.

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