CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (772,259)	$ 972
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	226,309	255,772
Write-down of oil and gas properties	1,011,385	47,130
Accretion expense	19,315	21,827
Deferred income tax (benefit) provision	(280,760)	3,599
Settlement of asset retirement obligations	(59,826)	(47,217)
Non-cash stock compensation expense	9,163	8,409
Non-cash derivative (income) expense	10,854	(2,386)
Non-cash interest expense	13,210	12,393
Change in current income taxes	7,211	(6)
(Increase) decrease in accounts receivable	33,895	(1,805)
Increase in other current assets	(1,090)	(10)
Decrease in accounts payable	(11,592)	(3,547)
Increase (decrease) in other current liabilities	(6,753)	37,441
Other	(82)	(172)
Net cash provided by operating activities	198,980	332,400
Cash flows from investing activities:
Investment in oil and gas properties	(385,528)	(727,488)
Proceeds from sale of oil and gas properties, net of expenses	11,643	223,299
Investment in fixed and other assets	(1,455)	(8,790)
Change in restricted funds	179,475	(185,752)
Net cash used in investing activities	(195,865)	(698,731)
Cash flows from financing activities:
Proceeds from bank borrowings	5,000	0
Repayment of bank borrowings	(5,000)	0
Net proceeds from issuance of common stock	0	225,999
Deferred financing costs	0	(3,329)
Net payments for share-based compensation	(3,127)	(7,161)
Net cash provided by (used in) financing activities	(3,127)	215,509
Effect of exchange rate changes on cash	(2)	(95)
Net change in cash and cash equivalents	(14)	(150,917)
Cash and cash equivalents, beginning of period	74,488	331,224
Cash and cash equivalents, end of period	$ 74,474	$ 180,307