Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 10,506	$ (107,912)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Deferred tax expense (benefit)	(474)	1,496
Depreciation, depletion and amortization	49,882	46,024
Ceiling test writedown	0	108,987
Accretion of asset retirement obligation	1,203	1,542
Share based compensation expense	3,105	5,609
Amortization costs and other	1,138	594
Non-cash derivative (income) expense	(202)	715
Payments to settle asset retirement obligations	(2,415)	(2,519)
Changes in working capital accounts:
Revenue receivable	(13,819)	141
Prepaid drilling and pipe costs	735	2,891
Joint interest billing receivable	13,612	20,312
Accounts payable and accrued liabilities	(11,781)	1,464
Advances from co-owners	(13,315)	(8,802)
Other	(5,266)	(2,866)
Net cash provided by operating activities	32,909	67,676
Cash flows used in investing activities:
Investment in oil and gas properties	(261,707)	(121,428)
Investment in other property and equipment	(970)	0
Sale of oil and gas properties	18,915	837
Sale of unevaluated oil and gas properties	0	6,083
Net cash used in investing activities	(243,762)	(114,508)
Cash flows provided by financing activities:
Net payments for share based compensation plans	(379)	(840)
Deferred financing costs	(487)	(33)
Payment of preferred stock dividend	(3,854)	(3,855)
Proceeds from issuance of 10% Senior Notes	200,000	0
Proceeds from bank borrowings	62,000	72,500
Repayment of bank borrowings	(37,000)	(37,500)
Net cash provided by financing activities	215,358	30,272
Net increase (decrease) in cash and cash equivalents	4,505	(16,560)
Cash and cash equivalents, beginning of period	14,904	22,263
Cash and cash equivalents, end of period	19,409	5,703
Cash paid during the period for:
Interest	19,479	15,628
Income taxes	11	15
Senior Notes [Member] | 10% Senior Notes [Member]
Cash flows provided by financing activities:
Deferred financing costs	$ 4,922	$ 0