CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net loss	$ (103,724)	$ (34,509)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, and amortization	41,718	92,347
Unrealized losses on derivative instruments, net	15,736	15,398
Ceiling test write-down of oil and natural gas properties	77,176	0
Stock-based compensation expense	2,294	6,479
Loss on debt extinguishment	0	25,223
Gain on asset dispositions, net	(21,391)	0
Other, net	3,034	2,903
Changes in operating assets and liabilities:
Accounts receivable	9,042	(4,168)
Other current assets	(2,165)	(269)
Accounts payable and accrued liabilities	(27,957)	17,956
Accrued interest and other	19,970	(10,948)
Net cash provided by operating activities	13,733	110,412
Capital expenditures for property and equipment:
Exploration, development, and leasehold acquisition costs	(94,786)	(205,099)
Other property and equipment	(4,794)	(1,115)
Proceeds from sales of assets	24,145	338,977
Net cash (used) provided by investing activities	(75,435)	132,763
Financing activities:
Proceeds from bank borrowings	0	320,000
Repayments of bank borrowings	0	(255,000)
Redemption of senior notes	0	(321,327)
Change in bank overdrafts	11,111	13,523
Other, net	(1,019)	(1,006)
Net cash provided (used) by financing activities	10,092	(243,810)
Net decrease in cash and cash equivalents	(51,610)	(635)
Cash and cash equivalents at beginning of period	66,192	1,056
Cash and cash equivalents at end of period	14,582	421
Cash paid during the period for:
Interest (net of capitalized amounts)	29,910	70,428
Income taxes (net of refunded amounts)	(21,312)	1,070
Non-cash investing activities:
Increase (decrease) in accrued capital expenditures	$ 1,449	$ (4,259)