Condensed Consolidated Statement of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 173,469	$ 110,798
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	205,779	140,783
Impairment of oil and gas properties	762	2,607
Deferred income taxes	102,244	66,648
Derivative instruments	41,838	(33,568)
Stock-based compensation expenses	8,411	6,627
Debt discount amortization and other	2,693	2,038
Working capital and other changes:
Change in accounts receivable	(67,487)	(69,163)
Change in inventory	(8,820)	(26,790)
Change in prepaid expenses	(5,175)	(2,009)
Change in other current assets	(138)	413
Change in other assets	(63)	(119)
Change in accounts payable and accrued liabilities	82,246	79,079
Change in other current liabilities	0	4,784
Change in other liabilities	922	0
Net cash provided by operating activities	536,681	282,128
Cash flows from investing activities:
Capital expenditures	(654,175)	(777,516)
Acquisition of oil and gas properties	(133,061)	0
Increase in restricted cash	(986,210)	0
Derivative settlements	(5,135)	2,784
Purchases of short-term investments	0	(126,213)
Redemptions of short-term investments	25,000	19,994
Advances from joint interest partners	(7,965)	17,508
Net cash used in investing activities	(1,761,546)	(863,443)
Cash flows from financing activities:
Proceeds from credit facility	160,000	0
Proceeds from issuance of senior notes	1,000,000	400,000
Purchases of treasury stock	(1,424)	(1,299)
Debt issuance costs	(21,718)	(7,955)
Net cash provided by financing activities	1,136,858	390,746
Decrease in cash and cash equivalents	(88,007)	(190,569)
Cash and cash equivalents:
Beginning of period	213,447	470,872
End of period	125,440	280,303
Supplemental non-cash transactions:
Change in accrued capital expenditures	10,530	71,572
Change in asset retirement obligations	$ 4,173	$ 7,774

The total of the component of interest expense representing the noncash expenses charged against earnings in the period to amortize the long-term deferred financing costs and other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

No definition available.