CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net earnings (loss)	$ 73,924	$ (1,288,931)	$ 142,829
Less: net earnings from discontinued operations	0	0	44,569
Net earnings (loss) from continuing operations	73,924	(1,288,931)	98,260
Adjustments to reconcile net earnings (loss) from continuing operations to net cash provided by operating activities of continuing operations:
Depreciation, depletion, and amortization	171,557	280,458	219,684
Deferred income tax	0	208,975	58,994
Unrealized losses (gains) on derivative instruments, net	30,923	39,126	(39,087)
Ceiling test write-down of oil and natural gas properties	57,636	992,404	0
Impairment of properties	0	79,529	0
Stock-based compensation expense	8,875	15,074	20,536
Accretion of asset retirement obligations	2,982	6,663	6,082
Gain on asset dispositions, net	(202,023)	0	0
Loss on debt extinguishment, net	48,725	36,312	0
Other, net	1,276	6,684	8,114
Changes in operating assets and liabilities:
Accounts receivable	31,816	11,573	23,236
Other current assets	3,504	2,630	14,314
Accounts payable and accrued liabilities	1,560	(21,164)	(6,470)
Accrued interest and other	(28,996)	2,322	(5,566)
Net cash provided by operating activities of continuing operations	201,759	371,655	398,097
Capital expenditures for property and equipment:
Exploration, development, and leasehold acquisition costs	(363,971)	(721,536)	(873,877)
Other fixed assets costs	(1,517)	(9,128)	(6,968)
Proceeds from sales of assets	1,347,116	262,882	121,115
Net cash provided (used) by investing activities of continuing operations	981,628	(467,782)	(759,730)
Financing activities:
Proceeds from bank borrowings	529,000	1,244,000	160,000
Repayments of bank borrowings	(594,000)	(1,284,000)	(55,000)
Issuance of senior notes, net of issuance costs	0	491,250	0
Redemption of senior notes	(1,037,174)	(330,709)	(285,000)
Proceeds from the exercise of options and from employee stock purchase plan	639	1,117	3,723
Change in bank overdrafts	(14,424)	(24,217)	17,116
Other, net	(2,292)	(3,270)	(14,144)
Net cash (used) provided by financing activities of continuing operations	(1,118,251)	94,171	(173,305)
Cash flows of discontinued operations:
Operating cash flows	0	0	101,292
Investing cash flows	0	0	(255,470)
Financing cash flows	0	0	478,324
Net cash provided by discontinued operations	0	0	324,146
Effect of exchange rate changes on cash	0	0	(3,476)
Net increase (decrease) in cash and cash equivalents	65,136	(1,956)	(214,268)
Net increase in cash and cash equivalents of discontinued operations	0	0	(289)
Net increase (decrease) in cash and cash equivalents of continuing operations	65,136	(1,956)	(214,557)
Cash and cash equivalents of continuing operations at beginning of year	1,056	3,012	217,569
Cash and cash equivalents of continuing operations at end of year	66,192	1,056	3,012
Cash paid by continuing operations during the year for:
Interest (net of capitalized amounts)	130,082	130,154	139,311
Income taxes (net of refunded amounts)	(755)	(28,253)	31,782
Non-cash investing activities of continuing operations:
Increase (decrease) in accrued capital expenditures	(28,154)	(37,766)	27,235
Common stock issued for acquisition of unproved oil and natural gas properties	$ 0	$ 36,431	$ 0