CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net earnings (loss)	$ (1,002,398)	$ 123,362
Less: net earnings from discontinued operations	0	44,569
Net earnings (loss) from continuing operations	(1,002,398)	78,793
Adjustments to reconcile net earnings (loss) from continuing operations to net cash provided by operating activities of continuing operations:
Depreciation, depletion, and amortization	213,802	155,227
Deferred income tax	208,990	46,724
Unrealized losses (gains) on derivative instruments, net	46,372	(40,538)
Ceiling test write-down of oil and natural gas properties	713,750	0
Impairment of properties	79,529	0
Stock-based compensation expense	12,227	17,809
Accretion of asset retirement obligations	4,914	4,496
Other, net	6,438	6,074
Changes in operating assets and liabilities:
Accounts receivable	9,070	29,686
Other current assets	4,426	8,262
Accounts payable and accrued liabilities	2,182	(5,096)
Accrued interest and other	(13,477)	3,977
Net cash provided by operating activities of continuing operations	285,825	305,414
Capital expenditures for property and equipment:
Exploration, development, and leasehold acquisition costs	(598,882)	(656,894)
Other fixed assets	(6,011)	(4,370)
Proceeds from sales of assets	8,902	120,956
Net cash used by investing activities of continuing operations	(595,991)	(540,308)
Financing activities:
Proceeds from bank borrowings	651,000	12,000
Repayments of bank borrowings	(756,000)	(12,000)
Issuance of senior notes, net of issuance costs	491,250	0
Payment of debt issue costs	(872)	(8,198)
Change in bank overdrafts	(37,716)	(20,660)
Other, net	(1,339)	(4,109)
Net cash provided (used) by financing activities of continuing operations	346,323	(32,967)
Cash flows of discontinued operations:
Operating cash flows	0	101,292
Investing cash flows	0	(255,470)
Financing cash flows	0	478,324
Net cash provided by discontinued operations	0	324,146
Effect of exchange rate changes on cash	0	(3,476)
Net increase in cash and cash equivalents	36,157	52,809
Net increase in cash and cash equivalents of discontinued operations	0	(289)
Net increase in cash and cash equivalents of continuing operations	36,157	52,520
Cash and cash equivalents of continuing operations at beginning of period	3,012	217,569
Cash and cash equivalents of continuing operations at end of period	39,169	270,089
Cash paid by continuing operations during the period for:
Interest (net of capitalized amounts)	88,619	94,398
Income taxes (net of refunded amounts)	979	31,523
Non-cash investing activities of continuing operations:
Increase (decrease) in accrued capital expenditures	(22,878)	38,927
Increase in asset retirement costs	4,786	2,553
Common stock issued for acquisition of unproved oil and natural gas properties	$ 36,431	$ 0