CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net loss	$ (75,610)	$ (41,800)
Adjustments to reconcile net loss to net cash provided from operating activities:
Loss from equity method investments, net of distributions	610	251
Deferred income tax benefit	(47,205)	(27,843)
Depletion, depreciation and amortization and impairment	115,101	100,151
Exploration dry hole costs	(159)	709
Mark-to-market on natural gas, NGLs and oil derivatives not designated as hedges	96,802	52,056
Abandonment and impairment of unproved properties	15,218	20,289
Unrealized derivative loss	3,455	948
Amortization of deferred financing costs, loss on extinguishment of debt and other	2,080	1,848
Deferred and stock-based compensation	54,991	2,508
Loss on the sale of assets	166	10,426
Changes in working capital:
Accounts receivable	1,292	11,947
Inventory and other	166	(897)
Accounts payable	5,775	8,962
Accrued liabilities and other	28,567	16,422
Net cash provided from operating activities	201,249	155,977
Investing activities:
Additions to natural gas and oil properties	(259,601)	(376,943)
Additions to field service assets	(1,071)	(1,622)
Acreage purchases	(8,794)	(74,268)
Equity method investments	1,885
Proceeds from disposal of assets	38,196	9,852
Purchases of marketable securities held by the deferred compensation plan	(17,936)	(3,061)
Proceeds from the sales of marketable securities held by the deferred compensation plan	6,316	2,183
Net cash used in investing activities	(241,005)	(443,859)
Financing activities:
Borrowing on credit facilities	368,000	340,000
Repayment on credit facilities	(1,060,000)	(527,000)
Issuance of subordinated notes	750,000	600,000
Dividends paid	(6,521)	(6,473)
Debt issuance costs	(12,098)	(11,242)
Issuance of common stock	343	1,266
Change in cash overdrafts	(12,458)	12,969
Proceeds from the sales of common stock held by the deferred compensation plan	12,432	1,168
Net cash provided from financing activities	39,698	410,688
(Decrease) increase in cash and cash equivalents	(58)	122,806
Cash and cash equivalents at beginning of period	252	92
Cash and cash equivalents at end of period	$ 194	$ 122,898