CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net loss	$ (21,007)	$ (67,948)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, and amortization	21,415	48,543
Unrealized losses on derivative instruments, net	8,391	38,311
Stock-based compensation expense	794	3,647
Loss on debt extinguishment	0	25,223
Other, net	1,874	2,140
Changes in operating assets and liabilities:
Accounts receivable	135	265
Other current assets	(1,764)	(1,109)
Accounts payable and accrued liabilities	(11,533)	(14,697)
Accrued interest and other	10,541	(53)
Net cash provided by operating activities	8,846	34,322
Capital expenditures for property and equipment:
Exploration, development, and leasehold acquisition costs	(46,380)	(101,665)
Other property and equipment	(3,520)	(268)
Proceeds from sales of assets	2,239	313,805
Net cash (used) provided by investing activities	(47,661)	211,872
Financing activities:
Proceeds from bank borrowings	0	202,000
Repayments of bank borrowings	0	(127,000)
Redemption of senior notes	0	(321,315)
Change in bank overdrafts	21,664	590
Other, net	(713)	(300)
Net cash provided (used) by financing activities	20,951	(246,025)
Net (decrease) increase in cash and cash equivalents	(17,864)	169
Cash and cash equivalents at beginning of period	66,192	1,056
Cash and cash equivalents at end of period	48,328	1,225
Cash paid during the period for:
Interest (net of capitalized amounts)	8,330	33,540
Income taxes (net of refunded amounts)	(5,856)	(129)
Non-cash investing activities:
(Decrease) increase in accrued capital expenditures	$ (2,170)	$ 26,303