CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015
Operating Activities
Net loss		$ (198,802)		$ (14,441)
Adjustments to reconcile net income (loss) to net cash provided by continuing operations activities:
Income (loss) from discontinued operations		(683)		17,971
Depreciation, depletion and amortization		286,149		481,027
Impairment of assets		95,088
Amortization of deferred major repair costs		2,002		2,108
Dry hole costs		(69)		78,629
Amortization of undeveloped leases		10,469		21,606
Accretion of asset retirement obligations		12,125		11,769
Deferred and noncurrent income tax benefits		(85,683)		(184,186)
Pretax gains from disposition of assets		(22)		(135,877)
Net (increase) decrease in noncash operating working capital		(104,347)	[1]	258,807
Other operating activities, net		27,085		(3,569)
Net cash provided by continuing operations activities		43,312		533,844
Investing Activities
Property additions and dry hole costs		(210,029)		(823,840)
Proceeds from sales of property, plant and equipment		33		417,242
Purchase of investment securities	[2]	(49,277)		(265,739)
Proceeds from maturity of investment securities	[2]	86,983		301,464
Other investing activities, net		(21,658)		(226)
Net cash required by investing activities		(193,948)		(371,099)
Financing Activities
Borrowings of debt		371,000		155,000
Repayments of debt				(450,000)
Capital lease obligation payments		(2,690)		(2,471)
Withholding tax on stock-based incentive awards		(1,052)		(8,976)
Cash dividends paid		(60,267)		(62,287)
Other financing activities, net				(108)
Net cash provided (required) by financing activities		306,991		(368,842)
Cash Flows from Discontinued Operations
Operating activities		2,312		(64,859)
Investing activities				46
Changes in cash included in current assets held for sale		(2,312)		64,707
Net decrease in cash and cash equivalents of discontinued operations				(106)
Effect of exchange rate changes on cash and cash equivalents		(16,475)		(6,103)
Net increase (decrease) in cash and cash equivalents		139,880		(212,306)
Cash and cash equivalents at January 1		283,183		1,193,308
Cash and cash equivalents at March 31		$ 423,063		$ 981,002

[1] 2016 balance includes payments for deepwater rig contract exit of $253.2 million.

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