Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (180,756)	$ 22,202
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Deferred tax expense	1,073	0
Depreciation, depletion and amortization	38,999	42,130
Ceiling test writedown	174,406	0
Accretion of asset retirement obligation	1,682	1,499
Share-based compensation expense	2,828	2,716
Amortization costs and other	1,162	1,094
Gain on sale of oil and gas properties	21,531	0
Payments to settle asset retirement obligations	(1,186)	(1,149)
Changes in working capital accounts:
Revenue receivable	8,735	455
Prepaid drilling costs	745	134
Joint interest billing receivable	(1,171)	8,589
Accounts payable and accrued liabilities	(36,051)	8,614
Advances from co-owners	17,846	15,438
Other	(1,155)	1,022
Net cash provided by operating activities	5,626	102,744
Cash flows provided by (used in) investing activities:
Investment in oil and gas properties	(62,451)	(76,993)
Investment in other property and equipment	(134)	(468)
Sale of oil and gas properties	257,698	600
Net cash provided by (used in) investing activities	195,113	(76,861)
Cash flows used in financing activities:
Net payments for share based compensation	432	1,039
Deferred financing costs	(829)	(109)
Payment of preferred stock dividend	(2,569)	(2,565)
Proceeds from bank borrowings	70,000	10,000
Repayment of bank borrowings	(145,000)	(12,500)
Net cash used in financing activities	(77,966)	(4,135)
Net increase in cash and cash equivalents	122,773	21,748
Cash and cash equivalents, beginning of period	18,243	9,153
Cash and cash equivalents, end of period	141,016	30,901
Cash paid (received) during the period for:
Interest	18,626	18,700
Income taxes (refunds)	$ (26)	$ 0