Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income (loss)	$ (11,661)us-gaap_NetIncomeLoss	$ 51,322us-gaap_NetIncomeLoss	$ 71,984us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	511,102	451,529	356,232
Amortization of debt issuance costs and premium	701	1,645	2,575
Share-based compensation	14,744us-gaap_ShareBasedCompensation	11,525us-gaap_ShareBasedCompensation	12,398us-gaap_ShareBasedCompensation
Derivative (gain) loss	(3,965)	8,470	13,954
Cash payments on derivative settlements, net	(5,318)	(8,589)	(7,664)
Deferred income taxes	(4,760)us-gaap_DeferredIncomeTaxExpenseBenefit	30,920us-gaap_DeferredIncomeTaxExpenseBenefit	88,109us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:
Oil and natural gas receivables	29,510	980	818
Joint interest and other receivables	(4,255)	34,257	(28,823)
Income taxes	3,143	44,328	(58,011)
Prepaid expenses and other assets	15,012	(10,044)	7,440
Asset retirement obligation settlements	(74,313)	(81,543)	(112,827)
Accounts payable, accrued liabilities and other	41,483	26,558	38,952
Net cash provided by operating activities	511,423	561,358	385,137
Investing activities:
Acquisition of property interest in oil and natural gas properties	(72,234)	(82,424)	(205,550)
Investment in oil and natural gas properties and equipment	(554,378)	(551,954)	(479,313)
Proceeds from sales of assets and other, net		21,008	30,453
Purchases of furniture, fixtures and other	(3,340)	(1,435)	(3,031)
Net cash used in investing activities	(629,952)	(614,805)	(657,441)
Financing activities:
Issuance of 8.50% Senior Notes			318,000
Borrowings of long-term debt - revolving bank credit facility	556,000	563,000	732,000
Repayments of long-term debt - revolving bank credit facility	(399,000)	(443,000)	(679,000)
Debt issuance costs		(3,892)us-gaap_PaymentsOfDebtIssuanceCosts	(8,510)us-gaap_PaymentsOfDebtIssuanceCosts
Dividends to shareholders	(30,260)us-gaap_PaymentsOfDividends	(58,846)us-gaap_PaymentsOfDividends	(82,832)us-gaap_PaymentsOfDividends
Other	(345)	(260)	379
Net cash provided by financing activities	126,395	57,002	280,037
Increase in cash and cash equivalents	7,866	3,555	7,733
Cash and cash equivalents, beginning of period	15,800	12,245	4,512
Cash and cash equivalents, end of period	$ 23,666	$ 15,800	$ 12,245

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