Condensed Consolidated Statement of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 208,786	$ 118,970
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	188,548	133,051
Gain on sale of properties	(187,033)	0
Impairment of oil and gas properties	804	706
Deferred income taxes	118,695	67,974
Derivative instruments	83,173	2,021
Stock-based compensation expenses	9,678	5,371
Debt discount amortization and other	3,220	1,753
Working capital and other changes:
Change in accounts receivable	(37,132)	(13,768)
Change in inventory	3,016	(4,200)
Change in prepaid expenses	1,284	(4,402)
Change in other current assets	(30)	330
Change in other assets	(1,477)	0
Change in accounts payable and accrued liabilities	91,543	48,701
Change in other current liabilities	3,311	688
Change in other liabilities	(132)	612
Net cash provided by operating activities	486,254	357,807
Cash flows from investing activities:
Capital expenditures	(606,924)	(428,630)
Payments to Acquire Oil and Gas Property	(8,116)	0
Proceeds from sale of properties	324,888	0
Costs related to sale of properties	(2,337)	0
Proceeds from Sale of Short-term Investments	0	25,000
Derivative settlements	(13,644)	2,932
Advances from joint interest partners	(5,919)	(5,593)
Net cash used in investing activities	(312,052)	(406,291)
Cash flows from financing activities:
Proceeds from Long-term Lines of Credit	100,000	0
Principal payments on revolving credit facility	(335,570)	0
Purchases of treasury stock	(3,315)	(364)
Debt issuance costs	(85)	(2,998)
Other	(176)	0
Net cash used in financing activities	(239,146)	(3,362)
Decrease in cash and cash equivalents	(64,944)	(51,846)
Cash and cash equivalents:
Beginning of period	91,901	213,447
End of period	26,957
Supplemental non-cash transactions:
Change in accrued capital expenditures	51,129	(6,085)
Change in asset retirement obligations	$ 1,624	$ 3,441

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.