CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net (loss) income	$ (91,710)	$ 27,684
Adjustments to reconcile net (loss) income to net cash provided from operating activities:
Deferred income tax (benefit) expense	(44,038)	22,366
Depletion, depreciation and amortization and impairment	163,601	147,290
Exploration dry hole costs	0	103
Abandonment and impairment of unproved properties	10,628	11,491
Derivative fair value income	(86,908)	(122,839)
Cash settlements on derivative financial instruments	109,466	97,490
Allowance for bad debt	200	250
Amortization of deferred financing costs, loss on extinguishment of debt and other	1,707	1,358
Deferred and stock-based compensation	29,128	9,218
Loss on the sale of assets	1,643	175
Changes in working capital:
Accounts receivable	18,752	54,435
Inventory and other	5,333	(1,072)
Accounts payable	11,922	7,098
Accrued liabilities and other	(42,300)	(44,409)
Net cash provided from operating activities	87,424	210,638
Investing activities:
Additions to natural gas and oil properties	(107,015)	(357,780)
Additions to field service assets	(631)	(672)
Acreage purchases	(19,497)	(30,126)
Proceeds from disposal of assets	113,079	10,660
Purchases of marketable securities held by the deferred compensation plan	(8,662)	(4,664)
Proceeds from the sales of marketable securities held by the deferred compensation plan	7,833	4,922
Net cash used in investing activities	(14,893)	(377,660)
Financing activities:
Borrowings on credit facilities	358,000	542,000
Repayments on credit facilities	(422,000)	(353,000)
Debt issuance costs	(124)	(1,700)
Dividends paid	(3,395)	(6,759)
Change in cash overdrafts	(6,368)	(15,341)
Proceeds from the sales of common stock held by the deferred compensation plan	1,414	1,893
Net cash (used in) provided from financing activities	(72,473)	167,093
Increase in cash and cash equivalents	58	71
Cash and cash equivalents at beginning of period	471	448
Cash and cash equivalents at end of period	$ 529	$ 519