CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net income (loss)	$ 32,521	$ (75,610)
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Loss from equity method investments, net of distributions	2,732	610
Deferred income tax expense (benefit)	18,951	(47,205)
Depletion, depreciation and amortization	128,682	115,101
Exploration dry hole costs	1	(159)
Abandonment and impairment of unproved properties	9,995	15,218
Derivative fair value loss	146,850	99,875
Cash settlements on derivative financial instruments that do not qualify for hedge accounting	(104,584)	382
Amortization of deferred financing costs and other	2,873	2,080
Deferred and stock-based compensation	12,593	54,991
Loss on the sale of assets	353	166
Changes in working capital:
Accounts receivable	(41,643)	1,292
Inventory and other	(5,358)	166
Accounts payable	9,997	17,061
Accrued liabilities and other	(32,742)	17,281
Net cash provided from operating activities	181,221	201,249
Investing activities:
Additions to natural gas and oil properties	(226,331)	(259,601)
Additions to field service assets	(3,084)	(1,071)
Acreage purchases	(50,690)	(8,794)
Equity method investments	2,511	1,885
Proceeds from disposal of assets	294	38,196
Purchases of marketable securities held by the deferred compensation plan	(8,247)	(17,936)
Proceeds from the sales of marketable securities held by the deferred compensation plan	9,310	6,316
Net cash used in investing activities	(276,237)	(241,005)
Financing activities:
Borrowing on credit facilities	412,000	368,000
Repayment on credit facilities	(318,000)	(1,060,000)
Issuance of subordinated notes		750,000
Dividends paid	(6,550)	(6,521)
Debt issuance costs		(12,098)
Issuance of common stock		343
Change in cash overdrafts	(1,122)	(12,458)
Proceeds from the sales of common stock held by the deferred compensation plan	8,586	12,432
Net cash provided from financing activities	94,914	39,698
Decrease in cash and cash equivalents	(102)	(58)
Cash and cash equivalents at beginning of period	348	252
Cash and cash equivalents at end of period	$ 246	$ 194