CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income (loss)	$ 19,225	$ (16,383)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	72,187	51,576
Accretion of firm transportation obligation	354	207
Derivative contracts:
Net losses	15,662	7,761
Cash settlements, net	(3,057)	3,557
Deferred income tax expense (benefit)	14,064	(8,789)
(Gain) loss on sales of assets, net	(56,826)	549
Non-cash exploration expense	3,294	5,262
Non-cash interest expense	1,012	946
Share-based compensation (equity-classified)	825	1,085
Other, net	206	81
Changes in operating assets and liabilities	(386)	(237)
Net cash provided by operating activities	66,560	45,615
Cash flows from investing activities
Capital expenditures - property and equipment	(159,804)	(85,973)
Proceeds from sales of assets, net	95,964	878
Net cash used in investing activities	(63,840)	(85,095)
Cash flows from financing activities
Proceeds from revolving credit facility borrowings	85,000	38,000
Repayment of revolving credit facility borrowings	(101,000)	0
Dividends paid on preferred stock	(1,725)	(1,687)
Other, net	1,085	(61)
Net cash (used in) provided by financing activities	(16,640)	36,252
Net decrease in cash and cash equivalents	(13,920)	(3,228)
Cash and cash equivalents - beginning of period	23,474	17,650
Cash and cash equivalents - end of period	9,554	14,422
Cash paid for:
Interest	1,025	340
Income taxes (net of refunds received)	$ 0	$ 0