CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net (loss) income	$ (39,960)	$ 61,015
Adjustments to reconcile net (loss) income to net cash provided from operating activities:
Income from discontinued operations		(15,484)
Loss from equity method investments, net of distributions	2,252	18,777
Deferred income tax (benefit) expense	(17,910)	35,345
Depletion, depreciation and amortization and impairment	333,293	282,810
Exploration dry hole costs	832	2,516
Mark-to-market on natural gas, NGLs and oil derivatives not designated as hedges	(30,076)	(67,093)
Abandonment and impairment of unproved properties	104,048	52,064
Unrealized derivative loss (gain)	5,061	(2,531)
Allowance for bad debts		446
Amortization of deferred financing costs, loss on extinguishment of debt and other	5,970	23,753
Deferred and stock-based compensation	58,573	66,759
Loss on the sale of assets	12,704	1,280
Changes in working capital:
Accounts receivable	(9,479)	(34,356)
Inventory and other	(5,394)	875
Accounts payable	11,074	(7,262)
Accrued liabilities and other	30,135	9,953
Net cash provided from continuing operations	461,123	428,867
Net cash provided from discontinued operations		19,478
Net cash provided from operating activities	461,123	448,345
Investing activities:
Additions to natural gas and oil properties	(1,151,167)	(859,785)
Additions to field service assets	(3,056)	(5,915)
Acreage purchases	(175,041)	(151,118)
Proceeds from disposal of assets	32,082	40,264
Purchase of marketable securities held by the deferred compensation plan	(33,997)	(15,626)
Proceeds from the sales of marketable securities held by the deferred compensation plan	21,485	8,452
Net cash used in investing activities from continuing operations	(1,309,694)	(983,728)
Net cash provided from investing activities from discontinued operations		840,723
Net cash used in investing activities	(1,309,694)	(143,005)
Financing activities:
Borrowing on credit facilities	1,139,000	490,826
Repayment on credit facilities	(865,000)	(764,826)
Issuance of subordinated notes	600,000	500,000
Repayment of subordinated notes		(413,698)
Dividends paid	(19,475)	(19,305)
Debt issuance costs	(12,606)	(22,003)
Issuance of common stock	2,073	585
Change in cash overdrafts	(15,750)	(39,761)
Proceeds from the sales of common stock held by the deferred compensation plan	20,388	11,878
Net cash provided from (used in) financing activities	848,630	(256,304)
Increase in cash and cash equivalents	59	49,036
Cash and cash equivalents at beginning of period	92	2,848
Cash and cash equivalents at end of period	$ 151	$ 51,884