CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net income (loss)	$ 170,111	$ (93,772)
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Deferred income tax expense (benefit)	112,395	(41,976)
Depletion, depreciation and amortization and impairment	149,821	163,601
Abandonment and impairment of unproved properties	4,420	10,628
Derivative fair value income	(165,557)	(86,908)
Cash settlements on derivative financial instruments	(4,181)	109,466
Allowance for bad debt	0	200
Amortization of deferred financing costs, loss on extinguishment of debt and other	1,310	1,707
Deferred and stock-based compensation	962	29,128
(Gain) loss on the sale of assets	(22,600)	1,643
Changes in working capital:
Accounts receivable	(4,690)	18,752
Inventory and other	2,868	5,333
Accounts payable	24,384	11,922
Accrued liabilities and other	(43,381)	(38,939)
Net cash provided from operating activities	225,862	90,785
Investing activities:
Additions to natural gas and oil properties	(186,727)	(107,015)
Additions to field service assets	(1,565)	(631)
Acreage purchases	(28,725)	(19,497)
Proceeds from disposal of assets	26,053	113,079
Purchases of marketable securities held by the deferred compensation plan	(12,388)	(8,662)
Proceeds from the sales of marketable securities held by the deferred compensation plan	10,231	7,833
Net cash used in investing activities	(193,121)	(14,893)
Financing activities:
Borrowings on credit facilities	448,000	358,000
Repayments on credit facilities	(484,000)	(422,000)
Repayment of senior notes	(500)	0
Debt issuance costs and other	0	(124)
Dividends paid	(4,951)	(3,395)
Taxes paid for shares withheld	(5,879)	(3,361)
Change in cash overdrafts	11,803	(6,368)
Proceeds from the sales of common stock held by the deferred compensation plan	3,017	1,414
Net cash used in financing activities	(32,510)	(75,834)
Increase in cash and cash equivalents	231	58
Cash and cash equivalents at beginning of period	314	471
Cash and cash equivalents at end of period	$ 545	$ 529